Robinson Chirinos is catching this afternoon and Ryan Mountcastle is the designated hitter, as the Orioles continue their series against the Guardians at sunny Camden Yards.

Adley Rutschman is counted among the reserves.

Tyler Nevin joins him, with Ramón Urías back at third base.

First baseman Trey Mancini has reached safely in 26 of his last 27 games since May 8 and is 41-for-115 (.365) since May 1.

Austin Hays’ hitting streak ended last night at 13 games.

Cionel Pérez has been so successful and dependable for the Orioles this season that any stumble feels like a hard fall.

Manager Brandon Hyde replaced starter Jordan Lyles with Pérez Thursday night after the veteran let the first three Mariners reach base in the sixth and allowed a run-scoring single to Eugenio Suarez. Hyde wanted Pérez to face the left-handed hitting Adam Frazier, and the inning never really matters.

It's all about the matchup.

Frazier lifted a sacrifice fly, Pérez walked the next two batters – including left-handed hitting Taylor Trammell - and Joey Krehbiel surrendered a two-run single to Luis Torrens.

Only the second earned run charged to Pérez this season in 20 games, his first since May 12 in St. Louis. His ERA skyrocketed to 1.08.

Bruce Zimmermann’s side work this week might have received as much attention as any start he’s made in 2022.

Zimmermann knew he had to try something else with the home runs against him reaching club-record proportions. The Orioles targeted the vulnerable areas, just as his opponents had done.

Mechanical adjustments were part of the process, nothing that they were going to broadcast to the world or just the Guardians. An attempt to get teams off his slider and changeup, which the Red Sox appeared to be sitting on during Sunday’s blowout loss.

In a game that demands adjustments, particularly from young pitchers, Zimmermann had to find a fix and hoped it began in the bullpen with pitching coach Chris Holt and assistant Darren Holmes.

“We believe in Zimm,” manager Brandon Hyde said before the game.

The Orioles are going to be without reliever Joey Krehbiel for at least 15 days due to right shoulder inflammation. However, they don’t seem concerned that his absence from the bullpen will be extensive.

“Hopefully, it’s just a couple weeks and give him time to rest it and work in the training room with Brian (Ebel) and the guys, and it won’t be too long,” manager Brandon Hyde said today.

Left-hander Nick Vespi returns to the Orioles with his 0.00 ERA and 26 strikeouts in 18 1/3 innings with Triple-A Norfolk. His major league debut consisted of two scoreless innings before the Orioles optioned him.

“He’s had an incredible year in Norfolk,” Hyde said. “It was just one of those situations where we needed to send him out last time out just from a numbers standpoint and what we needed in the bullpen the next day, unfortunately, because he threw the ball so well for us. So, we’re happy to have him back.

“With the new rules this year, it’s unfortunate that you have to wait a little longer to bring guys back, unless there’s an injury, but also, as you start getting more talented in your upper levels, start getting more talented in the big leagues, you start having to make tougher decisions. But as well is having talented guys in Triple-A to call up, so we’re excited to bring him back up as a bullpen option for us. He’s going to be live for us tonight.”

The Orioles announced the reported roster move this afternoon, with reliever Joey Krehbiel going on the 15-day injured list with right shoulder inflammation and left-hander Nick Vespi being recalled from Triple-A Norfolk.

But there were others.

Tyler Nevin was recalled from Norfolk and infielder Chris Owings went on the bereavement list. Nevin is starting at third base tonight.

Infielder Jahmai Jones was placed on unconditional release waivers. Jones underwent Tommy John surgery last week.

Adley Rutschman is catching Bruce Zimmermann tonight. Ramón Urías is on the bench.

The Orioles are recalling left-hander Nick Vespi from Triple-A Norfolk, an industry source confirmed. Vespi likely is coming back to replace reliever Joey Krehbiel, who exited last night’s game against the Mariners with right shoulder discomfort.

Krehbiel was scheduled to undergo tests on his shoulder today and appears headed to the 15-day injured list.

Vespi retired all three batters he faced last night and got two strikeouts. He threw 11 pitches, keeping him ready for tonight, and maintained a 0.00 ERA in 18 1/3 innings. He’s struck out 26 batters.

Vespi made his major league debut, and his only appearance, on May 20 against the Rays and tossed two scoreless innings.

Krehbiel faced two batters last night, his fastball velocity in steep decline, and exited the game after a two-run single and walk.

Keegan Akin had no idea that he held an Orioles’ record or that it existed. A visitor to his locker yesterday shared the news.

No Orioles reliever had thrown two or more innings in his first 11 appearances of the season. Akin blew past Jimmy Haynes for the team mark of 10 and has tied Chuck Crim for the major league record of 14 set in 1987.

“I did not know that,” Akin said, making no attempt to impersonate Johnny Carson.

The item is in the game notes, but Akin probably doesn’t peruse them at his locker.

“That’s pretty cool,” he said, smiling. “I didn’t see that.”

The Orioles received their biggest hit today a few hours before the game started, learning that baseball’s top pitching prospect, Grayson Rodriguez, might miss a significant portion of the season with a strained lat muscle.

A delayed debut stung worse than a fastball to the ribs, but the Orioles had the major league side of business to occupy them. Players on the 26-man roster trying to win a home series against the Mariners. Manager Brandon Hyde tasked with guiding them through it.

Process the news and move on from it.

The Orioles led twice through the midpoint of the game and rallied for three runs in the sixth to create another tie, their ability to bounce back from adversity not limited to past losses, but the Mariners scored against Jorge López in the 10^th and won 7-6 at Camden Yards.

López retired the first five batters he faced, but the automatic runner came home in the 10^th on Abraham Toro’s one-out triple to center field, the ball deflecting off Cedric Mullins’ glove near the fence. López had two runners in scoring position with two outs and stranded them, and his ERA tumbled to 1.05 after he worked 2 1/3 innings.

Grayson Rodriguez, the No. 1 pitching prospect in baseball who appeared on the verge of making his Orioles debut, has been diagnosed with a strained right lat muscle. He underwent an orthopedic exam and MRI earlier today in Baltimore, which revealed the exact nature of the injury.

Rodriguez left last night’s game at Triple-A Norfolk after 5 2/3 scoreless innings. Executive vice president/general manager Mike Elias said the right-hander will seek other opinions from the multiple physicians on the staff and consult various sports medicine doctors and those who are lat focused experts.

“Still in the process of assessing what the exact course of action and timetable would be associated with that, but we’re pretty confident that that’s the diagnosis that we’re working with,” Elias said.

“I think the good news is it’s his lat muscle and not more shoulder capsule, throwing arm related pathologies that you might see. It’s safe to say he’s going to miss some time, and probably a decent amount of time at a minimum, and we’ll take it from here. But it’s something that time should rectify at some point.

“Certainly a very disappointing development in terms of the 2022 calendar and our hopes and his, but it’s something that we’ll ultimately get through.”

Grayson Rodriguez is undergoing further testing today in Baltimore, and the Orioles hope to have more information later.

Rodriguez left last night’s start after 5 2/3 scoreless innings with discomfort in his right lat.

There’s definitely some concern within the organization because Rodriguez is the No. 1 pitching prospect in baseball and nearing his major league debut. But the team isn’t commenting until it receives more information.

Tonight’s lineup against the Mariners doesn’t include shortstop Jorge Mateo, who’s getting a day off. No issues with his health, according to manager Brandon Hyde.

Chris Owings has replaced Mateo at shortstop.

The smile, chuckle and slight eye roll gave away Trey Mancini’s opinion on the subject, and he didn’t need to hear the rest of the question.

He knew what was coming and found the amusement in it.

Adley Rutschman began last night’s game on the bench, a break that manager Brandon Hyde planned in advance. Baseball’s top prospect is living up to the defensive hype with his skills and energy behind the plate and handling of pitchers, but he’s 7-for-39 with no home runs and 10 strikeouts in 10 games.

Three of those strikeouts occurred in Tuesday’s series opener against the Mariners, after his second career two-hit game the previous night. A botched ruling on a checked swing was responsible for the first strikeout.

Do the veterans in the clubhouse make sure that Rutschman isn’t stressing over the slow start, that he remains unaffected by it?

The idea of platooning Orioles second baseman Rougned Odor doesn’t seem to carry the same logic as it did earlier in the season.

Manager Brandon Hyde kept Odor in the lineup tonight against Mariners left-hander Robbie Ray. One pitch validated his decision.

Odor jumped on a slider from Ray in the second inning and drove it to the back of the flag court for a three-run homer. And the Orioles were just getting started.

Didn’t matter who was on the mound. Didn’t matter where the ball was hit.

Ryan Mountcastle, Ramón Urías and Trey Mancini homered in the sixth inning after Sergio Romo entered the game, and the Orioles cruised to a 9-2 win at steamy Camden Yards.

While the Orioles are flashing their power tonight with four home runs, top pitching prospect Grayson Rodriguez tossed 5 2/3 scoreless innings at Triple-A Norfolk and walked off the mound with an athletic trainer after a lengthy conversation that included manager Buck Britton and pitching coach Justin Ramsey.

Rodriguez exited the game against Jacksonville with right lat discomfort, according to the Orioles. He’ll undergo further testing.

There’s nothing wrong with his elbow, which is the good news, but it's too early to know whether his next outing is in jeopardy.

John Means has dealt with a similar issue for several years, at times able to pitch through it and others missing weeks.

The latissimus dorsi is a large muscle covering the width of the middle and lower back.  It connects the bone of the upper arm to the spine and the hip.

The Orioles were expected to make a roster move this afternoon after left-hander Zac Lowther covered 5 1/3 innings last night. There was no reason to keep him in the bullpen while being unavailable for at least three days.

Lowther was optioned to Triple-A Norfolk, with Denyi Reyes returning to the club. Reyes can provide length out of the bullpen.

Manager Brandon Hyde appreciates that Lowther aided the ‘pen last night with an extended appearance, though the final line included six runs (five earned), plus two inherited from Bryan Baker.

“Zac did a great job for us,” Hyde said. “The first couple innings were a little rough. Once the game got to where it was, we really needed him to go as long as he possibly could, and he did that. I told him I appreciated the effort and I appreciated him staying out there for us. It allowed me not to use some other guys that I wouldn’t want to use in that type of situation, and unfortunately that’s just kind of the way the game goes. You option guys down.

“We got Denyi Reyes up here because of what he did in Boston and the things he’s done here to give us some relief help.”

The Orioles swapped out pitchers again today, recalling Denyi Reyes from Triple-A Norfolk and optioning left-hander Zac Lowther.

Lowther threw 100 pitches last night in 5 1/3 innings. Reyes was the 27^th man for Saturday’s doubleheader in Boston, allowing one run in 3 2/3 innings in Game 2, and remained eligible to be recalled in fewer than 10 days.

Lowther was the first Orioles reliever last night to throw at least 100 pitches since Gabriel Ynoa on May 5, 2017.

Adley Rutschman is on the bench tonight as the Orioles continue their series against the Mariners. He’s 7-for-39 in 10 games.

Trey Mancini is playing first base and Anthony Santander is the right fielder and cleanup hitter.

Pitching again in the majors is the only proverbial carrot that pitcher Zac Lowther needs dangled in front of him. He didn’t get the call until Monday morning. His bags are unpacked but he doesn’t know if he’s in for an extended stay, especially after working 5 1/3 innings last night.

There actually was more to it for Lowther beyond just leaving the minors. He knew from what he observed from a distance and heard from teammates that the Orioles are having a blast, and he wants badly to be included in it.

The fear of missing out can gnaw at a guy.

“You kind of see as a whole how the team has been playing and it’s fun baseball, it’s a different energy,” he said. “Obviously, I wasn’t here, but you can just see it on the field. It’s like, ‘Hey, I want to be a part of that.’ It’s a little more motivation, but you really don’t need anymore motivation than, it’s the big leagues. But when you’ve got guys like (Kyle) Bradish, who have pitching really well down in Triple-A, getting a chance, and then Adley (Rutschman), you knew it was only a matter of time with those two.

“Just being able to get back here with them is great, because they’re good guys, I enjoy spending time with them, enjoy playing with them. It’s a lot of very positive things. You’ve got really good pitchers at Triple-A like Cody (Sedlock) and Nick Vespi, who finally got their chance and they did really good. It was just fun to see.

Orioles manager Brandon Hyde didn’t carry any delusions of a long start tonight by Bryan Baker. He wasn’t raising the bar to three innings. This was strictly an opener arrangement followed by, if it worked as planned and hoped, significant coverage from Zac Lowther until Hyde could begin calling upon some of his high-leverage relievers.

The game didn’t reach the point where a tie or lead needed to be protected. The Orioles were in damage control. Live to play another night.

Baker was charged with three runs in 1 2/3 innings, Lowther let two inherited runners score and six of his own over 5 1/3, one unearned after a Ramón Urías error that assisted the Mariners in sending 10 batters to the plate in the third, and the Orioles began their homestand with a 10-0 loss.

Lowther retired 12 of 13 beginning with the final out in the third inning and got into the seventh at 100 pitches. Marcos Diplán didn't let the Mariners score in 1 1/3, and infielder Chris Owings made his second career pitching appearance in the ninth, allowing one run on two doubles.

Owings was trusted with 1 2/3 innings for the Royals in 2019 and surrendered four runs and six hits, including two homers. He allowed a leadoff double tonight to Eugenio Suárez after starting him with a 49 mph slider, induced a ground ball and shallow fly, and was burned by Taylor Trammell’s double down the right field line.

Zac Lowther and his family made plans for Memorial Day. Just relax on the beach, enjoy the break that minor league players receive on Mondays.

Then came the phone call at 11 a.m. from Triple-A Norfolk pitching coach Justin Ramsey.

“Normally,” Lowther said, “he’s not the one to call me.”

Lowther was told to get on a flight to Baltimore. The beach would have to wait for another morning.

Bags were packed for Lowther, his wife Brianna and 18-month-old daughter Isabelle. Not the stuff they’d take to the shore.

The Orioles' level of play has improved, no doubt, over the team that lost 110 games in 2021. That club won just 20 of 76 American League East division games (.263) last year and the current Orioles are 11-16 (.407) in the division.

They just completed a two-week run of games versus the AL East and went 7-8 against the Yankees, Rays, Yankees again and Red Sox. This run started with three straight losses at home to the Yankees and ended with a 7-5 stretch.

The Orioles have gone 4-9 versus the Yankees and 7-7 combined against the Rays and Red Sox, a year after going a combined 7-31 against those two clubs.

Red Sox manager Alex Cora threw the Orioles some props with reporters after Baltimore hammered his team 10-0 last night to win that series, three victories to two.

“Stuff-wise, they’re (pitching) really good,” Cora told reporters Monday night. “You see it. Everybody sees it. We saw it early in the season. … I'm not surprised, because that's how it started in Houston. It started with pitching.”

Cedric Mullins is leading off and playing center field tonight after getting a rest day for the final game in Boston.

Adley Rutschman is catching and batting fifth, followed by first baseman Ryan Mountcastle.

Ramón Urías is the third baseman again. Rougned Odor gets the start at second base against Mariners right-hander George Kirby.

Bryan Baker is making his second start. Left-hander Zac Lowther was recalled to provide a fresh bullpen arm and provide length.

For the Orioles
Cedric Mullins CF
Trey Mancini DH
Anthony Santander RF
Austin Hays LF
Adley Rutschman C
Ryan Mountcastle 1B
Rougned Odor 2B
Ramón Urías 3B
Jorge Mateo SS