Santander (shoulder) won't begin his rehab assignment as scheduled Tuesday due to lower-back tightness, Blake Murphy of Sportsnet.ca reports.

The injury doesn't appear to be a serious setback, but it's a worrying development given that the veteran outfielder has already been sidelined more than three months. According to Mitch Bannon of The Athletic, there's optimism Santander will be in the lineup with Triple-A Buffalo before the end of the week.

The Mets optioned Young to Triple-A Syracuse on Tuesday.

Young homered in his lone plate appearance after being recalled a week ago, but he will nonetheless be dispatched back to the minors. Jose Siri (tibia) is back from the 60-day injured list to take Young's roster spot.

Bell went 4-for-6 with two homers, six RBI and an additional run scored in Monday's 15-7 blowout of the Marlins.

The veteran first baseman notched his 11th career multi-homer performance, as he plated six or more runs for the second time. Bell cracked round trippers from both sides of the plate, blasting a 431-foot, two-run homer off southpaw reliever Josh Simpson in the sixth before returning the next inning to launch another two-run long ball off righty George Soriano. The 33-year-old Bell has been a steady performer since the All-Star break, batting .260 (34-for-131) with eight homers, 18 RBI and 18 runs scored over 40 games.

Yelich (back) will serve as the designated hitter and bat in the cleanup spot in Monday's game against the Rangers.

Lower-back soreness has kept Yelich off the field for the Brewers' past five games, but he has been cleared to return to the lineup for Monday's series opener. The 33-year-old has performed well at the plate in the home stretch of the 2025 season and has a .957 OPS with 27 runs, seven homers and 23 RBI in 133 plate appearances since Aug. 1.

O'Hearn is not in the lineup for Monday's game against the Reds.

The Padres will go with Gavin Sheets at designated hitter as the Reds send left-hander Nick Lodolo to the hill. The left-handed-hitting O'Hearn had started the previous four contests, including a pair versus southpaws.

Devers went 1-for-4 with an RBI and a run scored in Sunday's 4-3 loss to the Cardinals.

Devers lined an RBI single to center field in the sixth inning before coming around to score the team's final run. The 28-year-old has safely reached base in 12 consecutive games, batting .375 with six home runs and a 7:13 BB:K across 55 plate appearances during that span. Overall, he's slashing .263/.380/.492 with 100 RBI, 87 runs scored, 31 long balls and one stolen base in 645 plate appearances over 144 games between San Francisco and Boston.

Bell smacked a three-run home run in the ninth inning of Sunday's 6-3 win over the Cubs.

Bell started Sunday's game on the bench, with Andres Chaparro starting at first base. Bell was brought out for the ninth with two runners on base, and he put the Nationals on top for good with a three-run shot to center field. It was Bell's first homer since Aug. 20 and his 17th home run of the season, which is two shy from his mark in 2024. Bell has a .767 OPS with six home runs and 12 RBI in 148 plate appearances since the All-Star break.

Ohtani went 2-for-2 with a pair of solo home runs and three walks in Sunday's 5-2 win over the Orioles.

Ohtani led off the game with a 411-foot blast off Tomoyuki Sugano before extending the Dodgers' lead to 2-0 with his second long ball of the day in the top of the third. The two-way phenom had been stuck in an abbreviated slump coming into Sunday, going just 1-for-11 in his previous three games. Overall, he's slashing .279/.389/.612 with 48 home runs, 90 RBI, 127 runs scored and 17 stolen bases across 643 plate appearances this season.

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

Del Castillo had started in each of the Diamondbacks' previous three matchups with right-handed pitchers, but he'll hit the bench Sunday against the Red Sox's Brayan Bello. With Del Castillo taking a seat, Ketel Marte will serve as Arizona's designated hitter, which opens up a spot in the infield for Jordan Lawlar.

Pederson is out of the lineup for Sunday's game against the Astros.

Pederson will join fellow left-handed hitters Alejandro Osuna, Josh Smith, Rowdy Tellez and Dustin Harris on the bench as the Rangers stock up on right-handed bats to counter southpaw Framber Valdez. Jonah Heim will assume designated-hitter duties with Pederson out of the lineup.