Mountcastle is out of the lineup Sunday against the Red Sox.

Ryan O'Hearn will play first base and bat cleanup versus the Red Sox and right-hander Brayan Bello. Mountcastle went 0-for-11 with four strikeouts across the first two games of the Orioles' three-game weekend series in Boston.

Pratto is not in the lineup Sunday against the Blue Jays.

Pratto is being eased back into action after returning Friday from a several-week absence to heal a left groin strain. Nick Loftin will start at first base and bat seventh for the Royals on Sunday at Toronto.

Vaughn is absent from the lineup Sunday versus the Tigers.

Gavin Sheets will start at first base and bat seventh as Eloy Jimenez fills the DH role and hits cleanup. Vaughn went 0-for-4 with a strikeout in Chicago's loss to Detroit on Saturday.

Naylor went 1-for-4 with a solo home run in Saturday's 6-2 loss to the Angels.

Naylor's homer Saturday was his first extra-base hit in six contests since he returned from an oblique injury. He's still been productive with six RBI in that span while reclaiming a place in the heart of the Guardians' order. For the season, the first baseman is slashing .304/.347/.496 with 16 homers, 85 RBI, 42 runs scored and seven stolen bases over 102 games.

Diaz went 2-for-2 with an RBI double and walk-off, two-run homer in Saturday's 7-5 win over Seattle.

Diaz came off the bench as a pinch hitter in the seventh inning and delivered a go-ahead, RBI double before blasting a walk-off, two-run homer in the ninth. In 31 games since the beginning of August, the 32-year-old first baseman is hitting .320 with five home runs, 19 RBI and 23 runs scored across 128 at-bats.

Schanuel (shoulder) isn't in the Angels' lineup Saturday against the Guardians.

After exiting Friday's game with tightness in his shoulder, Schanuel will remain on the bench for Saturday's contest. He's still considered day-to-day, so there's a chance he'll be able to return to the lineup within a day or two. In the meantime, Mike Moustakas will start at first base while Eduardo Escobar covers third.

Diaz is not in the lineup for Saturday's game against Seattle, Marc Topkin of the Tampa Bay Times reports.

Diaz sits after grabbing just three hits across his last seven games. Even after that recent slump, his .315/.398/.491 season slash line still represents career bests in both average and slugging, and he also owns a career-best .889 OPS. Jonathan Aranda takes over at first base Saturday.

O'Hearn will sit Saturday against lefty Chris Sale and the Red Sox.

O'Hearn has been one of the surprises of the season for the AL-leading Orioles, with his .305/.338/.509 slash line far outpacing his .219/.293/.390 showing in five years with Kansas City. Despite that success, Baltimore has prevented him from facing lefties, giving him just 23 plate appearances against same-sided pitching all season.

Kirilloff will sit Saturday against lefty David Peterson and the Mets.

Kirilloff had only just returned Friday from a shoulder injury which kept him out for over a month, so it's possible he would have sat Saturday regardless of who was on the mound for the Mets. Donovan Solano will get the start at first base.

O'Hearn went 2-for-4 with a solo home run and an additional run scored in Friday's 11-2 win over the Red Sox.

O'Hearn has maintained solid hitting lately, going 15-for-43 (.349) with two homers and 11 RBI over his last 12 contests. The 30-year-old doesn't have an everyday role, but he's in the lineup more often than not as a strong-side platoon option. He's enjoyed a career year in 2023 with a .305/.338/.509 slash line, 12 homers, 51 RBI, 39 runs scored, four stolen bases, 18 doubles and a triple over 293 plate appearances.