The Orioles transferred Mountcastle (hamstring) from the 10-day injured list to the 60-day IL on Monday.

After suffering a Grade 2 right hamstring strain in a May 30 game, Mountcastle was placed on the IL one day later. Though the Orioles never provided a firm timeline for Mountcastle's recovery, the veteran first baseman had been expected to miss around 8-to-12 weeks due to the moderate hamstring strain, so his move to the 60-day IL won't affect his return date. Ryan O'Hearn is poised to see the bulk of the starts at first base for the foreseeable future, with Coby Mayo occasionally mixing in.

Gonzalez started at second base and went 1-for-3 with a walk and a solo home run in Sunday's 9-5 loss to the Giants.

Per usual, manager Alex Cora got Gonzalez's bat in the lineup against a lefty. Gonzalez typically plays first base, but Cora kept the productive Abraham Toro there and used Gonzalez at second base Sunday, the first game that Boston has faced a lefty since it demoted Kristian Campbell. The move worked offensively, as Gonzalez took Robbie Ray deep for his second homer of the season, but he also had a crucial error that led to three unearned runs crossing the plate. Gonzalez owns a 1.076 OPS against southpaws in 2025.

Lowe went 1-for-3 with a three-run home run and a sacrifice fly during Sunday's 13-7 loss to the Dodgers.

Lowe has been crushing the baseball lately, clubbing four homers in his last six games, including Sunday's three-run shot off Ben Casparius. The first baseman is 16-for-71 (.225) with 12 RBI and eight runs scored over 20 games in June. He's got a .699 OPS on the year.

Schanuel went 3-for-5 with a three-run home run, a double and an RBI single during Sunday's 8-7 loss to the Astros.

Schanuel notched his fifth three-hit game of the campaign, staying red-hot at the plate. The first baseman is 23-for-72 (.319) with three home runs, nine runs scored, 14 RBI and two stolen bases over his last 17 games. He's slashing .283/.372/.412 in 2025.

Solano went 3-for-5 with two home runs and five RBI in Sunday's win against the Cubs.

Solano ripped a solo shot in the fourth inning and a two-run homer in the seventh. He capped off his day with a two-run single during Seattle's five-run eighth inning. Solano posted three consecutive three-hit games during the weekend series against the Cubs, boosting his season OPS from .490 to .666 in the process. Solano did not homer in any of his first 38 games this season but has gone deep three times in the last six contests.

Singleton signed a minor-league contract with the Astros on Sunday, Chandler Rome of The Athletic reports.

Singleton was released from his minor-league contract with the Mets on Monday after batting .213 with a 12 home runs, 42 RBI, 37 runs scored and one stolen base over 55 games with Triple-A Syracuse this season. The 33-year-old first baseman will begin his third stint in the Astros organization after previously seeing big-league action with Houston in 2014 and 2015 and 2023 and 2024.

Hoskins went 2-for-3 with a solo home run, an additional run scored and two total RBI in Sunday's 9-8 win over the Twins.

Hoskins led off the second inning with a homer off David Festa, his 12th of the year, tying the game 2-2. The 32-year-old Hoskins has at least one hit in his last four games, going 5-for-15 with two homers and four extra-base hits in that span. Overall, he's slashing .248/.340/.439 with 40 RBI, 28 runs scored and a pair of steals across 288 plate appearances this season.

Schmitt went 4-for-4 with a solo home run, a double and two additional runs scored in Sunday's 9-5 victory over the Red Sox.

The 26-year-old infielder drew his 13th start at third base and fueled the Giants offense with his first career MLB game of three runs scored. This performance also marks Schmitt's second career four-hit contest, with the first coming at Arizona on May 11, 2023. The San Diego State product has filled in admirably while Matt Chapman (hand) has been sidelined. Through 104 total plate appearances, Schmitt is slashing .286/.369/.462 with four homers, 15 RBI and 11 runs scored.

Horwitz went 3-for-4 with two doubles, two RBI and three runs scored in Sunday's 8-3 win over the Rangers.

Horwitz was a thorn in the Rangers' side all game, highlighted by a two-run double during the Pirates' five-run fifth inning. Over his past 10 games, the 27-year-old has hit safely eight times, collecting four doubles, three RBI and seven runs scored. He's slashing .245/.316/.349 with one home run, nine RBI and 14 runs scored across 117 plate appearances while primarily starting against right-handed pitching.

Smith is out of the lineup for Sunday's game against the Red Sox.

The left-handed-hitting Smith will take a seat against a right-handed pitcher (Lucas Giolito) for the second time in the series. Smith has produced an .801 OPS in 16 games since joining the Giants earlier this month, but he could nonetheless have to settle for a part-time role at first base against right-handed pitching with the acquisition of Rafael Devers having displaced Wilmer Flores from the designated-hitter spot.