NEW YORK – Mets catcher Francisco Alvarez sat on a fastball last night like it was a clubhouse sofa.

Alvarez got ahead 3-0 against Orioles reliever Seranthony Domínguez – oh, let’s just call him the closer and stop hedging – and unloaded for his first career walk-off hit of any kind. And man, did he enjoy it.

Well, what he saw of it.

Alvarez made contact, held up the bat with one hand, released it and turned to the Mets dugout. He never looked back at the ball, gesturing to teammates with both hands and slapping his chest multiple times before beginning to round the bases. His jersey was pulled below his left shoulder after reaching home plate and being mobbed.

Domínguez struck out the first batter he faced. He struck out three Red Sox in the ninth inning the previous day. But he’s also surrendered home runs in back-to-back appearances.

The Orioles elevated Eloy Jiménez to the cleanup spot for this afternoon’s series finale against the Red Sox.

Jarren Duran robbed Jiménez of a home run last night with a leaping catch at the center field fence in the ninth inning. Jiménez is 14-for-33 (.424) with the Orioles.

Adley Rutschman returns to the lineup after pinch-hitting last night. He began the past two games on the bench due to lower back discomfort.

Ryan O’Hearn is in right field and batting second. Anthony Santander isn’t in the lineup.

Gunnar Henderson, in the third slot again today, is batting .346 against fastballs this month compared to his .262 mark in July.

The Orioles recalled reliever Colin Selby this morning from Triple-A Norfolk as the replacement for Cade Povich, who was optioned following last night’s 5-1 loss to the Red Sox.

Selby was acquired from the Royals for cash considerations on July 11. He’s allowed six earned runs and seven total with 10 hits in nine innings.

Selby, 26, appeared in two games with the Royals this season and allowed two earned runs and three total in three innings. His last appearance was May 4 against the Rangers, which came after a scoreless inning the previous night. He posted a 9.00 ERA in 21 games (five starts) with the Pirates in 2023.

His last appearance with the Tides was Thursday. He didn't allow an earned run in four straight outings before surrendering three in two-thirds of an inning.

Povich’s latest stay in Baltimore was destined to be brief. He was charged with two earned runs last night in a career-high 6 1/3 innings and left to a standing ovation, but the Orioles recalled him only to make the one start and push back everyone else in the rotation.

The Orioles acquired right-hander Colin Selby, 26, from the Royals today for cash considerations and optioned him to Triple-A Norfolk. Kyle Bradish was moved to the 60-day injured list to make room on a full 40-man roster.

Selby, a Virginia native, made two relief appearances with the Royals and allowed two earned runs (three total) in three innings. He appeared in 21 games with the Pirates last season, making five starts, and had a 9.00 ERA and 1.833 WHIP in 24 innings.

He’s averaged 5.7 walks and 10 strikeouts per nine innings in the majors.

Austin Hays remains in left field, as the Orioles try to avoid being swept by the Cubs in their three-game series.

Hays is slashing .340/.379/.574 (32-for-94) with 13 doubles, three home runs, 12 RBIs, three walks, four hit-by-pitches and 14 runs in 35 games since returning from the injured list on May 13.