Emmanuel Rivera is playing third base today as the Orioles try for the series win against the Rays at Camden Yards.

James McCann is catching, with Adley Rutschman serving as designated hitter. Jackson Holliday is batting seventh.

Zach Eflin is facing his former team for the second time this season. He shut them out on four hits in seven innings on Aug. 9 at Tropicana Field.

Eflin has registered five quality starts in a row. He returned from the injured list Sunday and held the Rockies to one run and four hits with nine strikeouts in seven innings.

According to STATS, Eflin is the fifth pitcher to begin his Orioles career with five straight quality starts and the first since Ken Dixon had six in a row spanning the 1984-85 seasons. Only Dixon, Ross Grimsley (seven) and Pete Richert (six) extended their streaks past five starts.

Dean Kremer is set to take his scheduled turn tonight for the series opener against the Rays at Camden Yards, avoiding the injured list after Jordan Beck’s line drive Saturday night slammed off his right forearm.

Kremer registered three quality starts in a row before leaving the Rockies game after 3 1/3 innings with a huge welt above his wrist.

The Rays are seeing Kremer for the first time this season. He’s made six career starts against them and posted a 2.79 ERA in 29 innings.

Brandon Lowe is 4-for-9 with a home run against Kremer. Yandy Díaz is 1-for-13.

Nick Maton is starting at third base and batting ninth, a spot ahead of Jackson Holliday. Coby Mayo is on the bench again.

Anthony Santander is in right field tonight and Coby Mayo stays on the bench as the Orioles continue their series against the White Sox at Camden Yards.

Eloy Jiménez is the designated hitter. Emmanuel Rivera is at third base.

Gunnar Henderson hit his 34^th home run yesterday to tie Cal Ripken Jr. (1991) and Miguel Tejada (2004) for most by an Orioles shortstop in a season. He produced the team’s 12^th leadoff homer to tie the record set in 1996.

Austin Slater is batting .295/.404/.432 (13-for-44) since joining the Orioles, but he’s on the bench tonight. Colton Cowser is in left field and Cedric Mullins is in center.

Rookie Cade Povich is making his 12^th major league start and trying to lower a 6.58 ERA and 1.731 WHIP accumulated over 52 innings. Povich has allowed 10 runs and 18 hits in his last two starts over 8 1/3 innings.

Riding the high of Friday's comeback win over Houston, the Orioles (75-55) host the Astros (69-59) today in the third game of the four-game series at Oriole Park.

After being shut out 6-0 on three hits in the series opener Thursday, the O's were down 5-2 when they batted in the eighth inning last night. Anthony Santander hit his 38th homer, a go-ahead grand slam that produced a 6-5 lead and eventual 7-5 win.

When Santander produced the slam, at that point the Orioles had been 2-for-31 with runners in scoring position the last seven games. 

The Orioles snapped a five-game losing streak versus Houston after going 0-4 against the Astros this year. Houston had won nine in a row on the road. 

Today the Baltimore batters have a real challenge in facing lefty Framber Valdez (13-5, 3.20 ERA). He finished 11th in the American League Cy Young Award voting in 2020, fifth in 2022 and ninth last year.

Ryan Mountcastle is out of the Orioles lineup tonight after leaving last night’s game in the ninth inning with wrist soreness.

Ryan O’Hearn is playing first base and Adley Rutschman is the designated hitter and batting second.

The Orioles began the day 1 ½ games behind the Yankees in the division race and they’re counting on rookie Cade Povich, making his 10^th major league start, to give them length before turning to the bullpen.

Povich lowered his ERA to 5.77 by holding the Red Sox to two runs over a career-high 6 1/3 innings in his last start. He was optioned later that night but returned with Zach Eflin on the injured list.

Left-hander Keegan Akin was reinstated from the paternity list and the Orioles optioned lefty Nick Vespi, who tossed a scoreless inning last night.

PHILADELPHIA – After winning three of their last four heading into Wednesday’s finale against the Orioles, the Nationals have now dropped three straight games. Following Thursday’s blowout loss to the Phillies, there were some encouraging signs last night before Trea Turner walked it off in the bottom of the ninth. And now there are question marks heading into tonight’s game.

Will the starting pitcher get deeper into the game? Will the offense score in the early innings? What is the state of the bullpen after covering nearly 10 innings over the last two nights?

MacKenzie Gore’s struggles over the last 2 ½ months have been well-documented and disappointing. The only positive sign lately is that the five runs he gave up against the Angels on Sunday were all unearned. The Nationals worked on some things with the young left-hander in his bullpen session on Wednesday in Baltimore. Hopefully that translates into better results tonight, otherwise the Nats may have a serious problem on their hands.

Offensively, the Nats will look to get some early production off Cristopher Sánchez, the only southpaw starter they will face this weekend. Sánchez is 8-8 with a 3.63 ERA and 1.325 WHIP. An All-Star this year, he does an excellent job of keeping the ball in the yard with his 0.3 home runs allowed per nine innings leading the major leagues. He started the only game the Nats have won against the Phillies this year on April 7, when he gave up three runs in 4 ⅓ innings. But he came back on May 18 to hold them to two runs over seven innings.

Tonight’s game is listed as starting at 6:05 p.m., but the actual start time is closer to 6:30 p.m. The Phillies are hosting a pregame ceremony for an enshrinement into their Wall of Fame and listed an earlier start time to get more people into the stadium for it. MASN’s “Nats Xtra” pregame show starts at 6 p.m. on MASN2 and will take you up to first pitch, whenever it is. And yes, the Nats were here last year for the same ceremony.

Adley Rutschman is leading off tonight against Red Sox left-hander Brennan Bernardino, who’s only made two starts among his 44 appearances and will serve as an opener.

Colton Cowser moves down to fifth in the order. Eloy Jiménez is the designated hitter.

Ramón Urías makes another start at third base.

Corbin Burnes makes his 25^th start for the Orioles. Nineteen of the first 24 are quality, and he’s gone 12-4 with a 2.71 ERA and 1.049 WHIP.

Burnes has made two starts against the Red Sox this year and held them to a combined two runs (one earned) and five hits in 14 innings. He’s faced them three times in his career and allowed five runs (three earned) and 10 hits in 19 innings.

Austin Slater is leading off and playing left field tonight and Coby Mayo is at third base against a left-handed opposing starter.

Eloy Jiménez is the designated hitter. Colton Cowser is in center field.

Jackson Holliday stays at second base and is batting ninth.

Dean Kremer has made two career starts against the Nationals and is 2-0 with a 2.31 ERA in 11 2/3 innings.

Kremer has held opponents to a .523 OPS his first time through the order, compared to .817 for the rest of the game.

Coby Mayo is out of the Orioles lineup for tonight’s series opener against the Nationals at Camden Yards.

Ramón Urías gets the start at third base. Ryan O’Hearn is serving as the designated hitter.

Colton Cowser is in left field, Cedric Mullins is in center and Anthony Santander is in right.

Left-hander Trevor Rogers is making his third start with the Orioles after allowing seven earned runs and eight total in 9 1/3 innings. He’s faced the Nationals twice this season with the Marlins and allowed five runs in 12 innings.

Rogers has made 10 career starts against Washington and posted a 3.35 ERA and 1.283 WHIP in 48 1/3 innings. He’s never allowed more than three earned runs.

ST. PETERSBURG, Fla. – Zach Eflin returns to Tropicana Field tonight as an opposing pitcher, making his first start at Tampa Bay since the Rays traded him to the Orioles.

Eflin has two quality starts in his two outings with the Orioles, allowing a combined five runs and 15 hits in 12 1/3 innings. He’s walked only one batter.

Eflin has registered a 3.08 ERA in 27 games (26 starts) at Tropicana Field. He’s made two career appearances (one start) against the Rays and allowed four runs in 7 1/3 innings.

Adley Rutschman, Ryan Mountcastle and Coby Mayo are out of tonight’s lineup.

Jackson Holliday is batting sixth. Ramón Urías is playing third base.

CLEVELAND – Austin Slater is leading off for the Orioles tonight in a right-handed version of their lineup.

Ryan Mountcastle is batting second. Eloy Jiménez makes his first start as the designated hitter. Coby Mayo is at third base.

Adley Rutschman is on the bench. Jackson Holliday stays at second base.

Zach Eflin makes his second Orioles start after allowing three runs and 10 hits in six innings against the Blue Jays in his debut. His only career start against the Guardians, on Aug. 13, 2023, was a struggle as he gave up six runs and nine hits in three innings. Andrés Giménez homered.

Eflin has never pitched at Progressive Field.

Zach Eflin makes his Orioles debut today in Game 1 of a doubleheader against the Blue Jays at Camden Yards.

Eflin made his last Tampa Bay start against the Blue Jays in Toronto and allowed two runs in 5 2/3 innings. He also faced them May 18 at Rogers Centre and allowed four runs and nine hits in six innings. His first start in 2024 also was against the Jays, at Tropicana Field, and he surrendered six runs in 5 2/3 innings.

George Springer, Cavan Biggio and Vladimir Guerrero Jr. hit home runs.

Eflin owns a 5.90 ERA and 1.487 WHIP in eight career games (seven starts) against the Jays. Guerrero is 6-for-16 with a double and two home runs.

The right-hander is making his third career start at Camden Yards. He’s allowed five runs in 13 innings there.

The Orioles activated new starter Zach Eflin and assigned him uniform No. 24. Eflin threw yesterday and is a candidate to start one of the games in Monday’s doubleheader.

Reliever Bryan Baker was optioned after yesterday’s game.

The Orioles will try to avoid a sweep this afternoon with Colton Cowser leading off and playing left field. Gunnar Henderson is batting third. Henderson has committed an error in three consecutive games.

Cedric Mullins is in center field again after his two-run double and two-run homer yesterday. His 430-foot shot was the third-longest of his career.

Adley Rutschman is on the bench. He’s 9-for-68 (.132) this month.

The Orioles are playing a home game tonight for the first time since the dramatic walk-off win against the Yankees on July 14. They’re 30-22 at Camden Yards and 31-19 on the road.

The Padres are making their first visit since 2019, which again brings Manny Machado back to Baltimore. They won both games.

Only the Giants have gone longer without returning to Baltimore, edging the Padres by 24 days.

Heston Kjerstad is in left field and Colton Cowser is in center. Connor Norby is playing second base and batting ninth.

Kjerstad now dresses at the locker that used to belong to Austin Hays, who was traded today to the Phillies for reliever Seranthony Domínguez and outfielder Cristian Pache. Domínguez and Pache didn’t have lockers set up this afternoon and the Orioles didn’t announce another roster move.

MIAMI – The Orioles made a few roster moves to get right-hander Chayce McDermott from the taxi squad to the active roster. He will make his big league debut tonight and get the start on the mound versus the Marlins.

To get McDermott on the active roster, right-hander Bryan Baker was optioned to Triple-A Norfolk. To add him to the 40-man roster, right-hander Jonathan Heasley was designated for assignment.

McDermott will wear No. 60.

Over 20 games at Triple-A, he went 3-5 with a 3.96 ERA. In 91 innings, he had a 5.34 walks-per-nine-innings rate and 12.76 strikeouts-per-nine-innings rate.

McDermott leads the International League in strikeouts and is tied for the overall minor league lead.

ARLINGTON, Texas – The Orioles go for the sweep of the Rangers this afternoon with Adley Rutschman leading off, Austin Hays in left field and Ryan Mountcastle at first base.

Gunnar Henderson is on the bench.

Hays is 5-for-12 with two doubles and two home runs against Rangers left-hander Andrew Heaney. Mountcastle is 4-for-8 with two doubles and two homers.

Jordan Westburg is batting second and playing second base. Jorge Mateo is the shortstop. Colton Cowser is in center field and James McCann is catching.

Dean Kremer is the No. 3 starter in the rotation coming out of the break. He’s gone four and 4 2/3 innings in his last two outings.

The Orioles close out the first half this morning with Austin Hays in the lineup after he left yesterday’s game with hip soreness.

Colton Cowser is in center field, starting again versus a left-hander. James McCann is catching and Adley Rutschman is the designated hitter.

Jorge Mateo is playing second base.

Kyle Stowers is here but on the bench again today.

Dean Kremer has a 4.42 ERA and 1.186 WHIP in 11 starts. He faced the Yankees on April 30 in Baltimore and allowed two runs and four hits in seven innings. Austin Wells and Juan Soto homered.

The Orioles tweaked the bullpen again this afternoon.

Right-hander Vinny Nittoli had his contract selected from Triple-A Norfolk and rookie starter Cade Povich was optioned after last night’s game.

Left-hander Danny Coulombe was transferred to the 60-day injured list to make room on the 40-man roster.

Nittoli allowed one run and struck out four batters in three innings with Norfolk. The Orioles signed him to a minor league contract on July 2 after the Cubs designated him for assignment.

Nittoli appeared in seven games with the Athletics this season and allowed two runs in eight innings. He appeared in one game with the Mariners in 2021, two with the Phillies in 2022 and three with the Mets last summer. He’s registered a career 3.07 ERA in 14 2/3 innings.

Orioles manager Brandon Hyde gave some props to the fans today. The Orioles-Cubs game last night, the series opener that Chicago won 9-2, saw an attendance of 30,373.

According to the Baltimore Sun, that was the largest Tuesday night crowd at Oriole Park since the Orioles and Mets drew 34,068 on Aug. 18, 2015.

“You know, I remember it when we had some 8,000 nights," said Hyde. "So, to have 30,000, wish we would have played better. To have people support us, the fans and the area support us the way they are, it’s a noticeable difference.

“You just feel more of a buzz. More of a buzz in the crowd and you are not hearing individual conversations above your dugout. It’s more of a big baseball feel. You hear the roar of the crowd instead of individual sections.”

At this point there are four Orioles headed to the All-Star Game in Texas: starters Gunnar Henderson and Adley Rutschman, along with pitcher Corbin Burnes and infielder Jordan Westburg.

Austin Hays is in the Orioles lineup tonight for the first time since Tuesday. His knee soreness has dissipated and the Rangers are starting left-hander Andrew Heaney. It’s time for him to play.

Left field is back in Hays’ possession.

Ryan Mountcastle is on the bench, where he also began last night’s game before pinch-hitting. An explanation will come later.

Heston Kjerstad, who hit a grand slam last night, is the designated hitter while Ryan O’Hearn plays first base. Jordan Westburg is the cleanup hitter. Colton Cowser is in center field and batting ninth.

Gunnar Henderson’s on-base streak has reached 36 games. He’s leading off against a left-hander, with Adley Rutschman batting second.