Arenado (shoulder) will be activated from the 10-day injured list ahead of Monday's game against the Reds, Derrick Goold of the St. Louis Post-Dispatch reports.

The veteran third baseman has gone 1-for-13 during his minor-league rehab assignment with Double-A Springfield and will return to St. Louis on Monday after an absence of over six weeks due to a shoulder strain. Arenado is in the midst of the worst season of his career with a .245/.294/.366 slash line in 96 games.

Karros is out of the lineup for Sunday's game against the Padres.

Karros will hit the bench after he started in each of the last six games while going 2-for-20 with one walk and six strikeouts. Kyle Farmer will step in for Karros at third base and will bat seventh.

Muncy is out of the lineup for Sunday's game against the Giants.

The left-handed-hitting Muncy will be held out of the lineup for second time in four games while the Dodgers face off against another left-handed starter (Robbie Ray). Enrique Hernandez will fill in for Muncy at third base and will bat eighth.

Baty is out of the lineup for Sunday's game against the Rangers, Anthony DiComo of MLB.com reports.

It's the third baseman's fifth absence in New York's past six games, with all of those absences coming versus left-handed starting pitchers. Baty has been filling the strong side of a platoon at third base and has a .762 OPS through 10 games in September, which should be enough for him to retain that role despite the recent downturn in playing time.

Rivera is out of the lineup for Sunday's game against the Blue Jays.

Rivera started at third base in each of the last three games, but he could fade into more of a part-time role after Tyler O'Neill was reinstated from the injured list Friday. Though O'Neill served as the Orioles' designated hitter in his first two games upon his return, he may see more time in right field moving forward, which would likely result in Jeremiah Jackson poaching starts from Rivera at third base. Since being promoted from Triple-A Norfolk on Aug. 27, Rivera has slashed a weak .265/.265/.286 over 13 games.

Machado is out of the lineup for Sunday's game against the Rockies.

In what appears to be a planned rest day, Machado will get a first day off of the season after starting in each of the Padres' first 149 games of the campaign. Jose Iglesias will step in at third base for Machado, who went 4-for-10 with two home runs, two walks, four RBI and four runs through the first three games of the series.

House is out of the lineup for Sunday's game against the Pirates, Mark Zuckerman of MASNSports.com reports.

House will take a seat Sunday after a run of five straight starts, during which he went 4-for-17 with a double and a solo homer. Paul DeJong is manning the hot corner and batting seventh in the series finale for the Nationals.

Chapman went 2-for-4 with two runs scored, an RBI, a double and a walk in Saturday's 13-7 loss to the Dodgers.

Chapman lined an RBI single to left field in the first inning before coming around to score. He added a double in the fifth and scored once again, marking his fourth multi-hit performance across 11 games this month. He's slashing .361/.465/.722 with 10 runs scored, seven RBI, four doubles and three home runs across 43 plate appearances in September. Overall, he has recorded a .243/.352/.456 slash line with 70 runs scored, 57 RBI, 21 long balls and nine stolen bases in 480 plate appearances this season.

Bregman went 1-for-5 with a solo home run in Saturday's 5-3 loss to the Yankees.

Bregman put the Red Sox on the board with his fifth-inning homer, reducing the deficit to 4-1. The blast was his first one since Aug. 12, ending a drought of 27 games. During that span, Bregman slashed .214/.305/.262 with seven RBI.

Machado went 2-for-3 with a solo home run, a walk, three total RBI and two runs scored in Saturday's 11-3 win over the Rockies.

This was Machado's fourth homer in the last 10 games, though he has gone just 7-for-39 (.179) in that span. The third baseman is also up to 25 long balls on the year, a mark he has reached in each of the last 10 full-length seasons. Machado would need an impressive run of power to get back to 30 homers after missing that threshold last year. He's added a .277/.338/.464 slash line with 88 RBI, 85 runs scored, 33 doubles and 13 stolen bases over 149 contests in 2025.