Guerrero left Monday's game against the Pirates due to left hamstring tightness.

The severity of Guerrero's injury is not yet clear. He'll presumably be sent for additional scans to determine whether he can take the field Tuesday. Ty France would be in line for chances at first base if Guerrero is forced to miss more time.

Guerrero (undisclosed) was removed from Monday's contest against the Pirates in the fifth inning, Mitch Bannon of The Athletic reports.

Guerrero was replaced at the plate by Ty France with two outs in the top of the fifth inning. It's unclear why Guerrero exited the contest, but more information on his status will likely come in the near future. The first baseman will end his day having gone 0-for-2 from the plate with an RBI and a strikeout.

Lowe signed a one-year contract with the Red Sox on Monday but won't be included in the lineup for the team's series opener versus the Orioles.

The switch-hitting Abraham Toro will draw the start at first base while the Red Sox face off against lefty Trevor Rogers in the series opener, but the left-handed-hitting Lowe is likely to occupy the strong side of a platoon at the position with Toro or the right-handed-hitting Romy Gonzalez. Lowe was in the midst of a disappointing season with Washington before he was released over the weekend, but he had performed at a slightly above league-average level against right-handed pitching, slashing .235/.312/.412 with a 104 wRC+ over 337 plate appearances.

Mayo is out of the lineup for Monday's game against the Red Sox.

Mayo will give way to Ryan Mountcastle at first base in the series opener in Boston, after Mayo had started in each of the Orioles' previous six contests. After a productive stretch at the plate coming out of the All-Star break, Mayo has taken a step back offensively to begin August; he's slashing just .160/.222/.320 with four extra-base hits through 15 games this month. With top prospect Samuel Basallo getting called up from Triple-A Norfolk on Sunday and likely to see a near-everyday role while bouncing between designated hitter, catcher and first base, Mayo may need to pick up the pace to hold off both Basallo and Mountcastle for at-bats.

The Rangers placed Burger on the 10-day injured list Monday with a left wrist sprain, Evan Grant of The Dallas Morning News reports.

Burger exited Sunday's game against the Royals due to wrist discomfort, and a follow-up MRI revealed a sprain. The severity of the sprain isn't known, so it's unclear how much time Burger might miss. Rowdy Tellez should continue to see the bulk of the starts at first base against right-handed pitching, with Ezequiel Duran stepping in versus southpaws.

Locklear is not in the lineup for Monday's game against the Guardians.

Pavin Smith is starting at first base in his first game back from the injured list. Locklear had started each of the previous 16 contests and should still function as the team's primary first baseman down the stretch, but Smith could eat into his playing time somewhat.

Contreras (foot) will start at first base and bat cleanup in Monday's game against the Marlins.

Contreras missed the previous four games after being hit on the foot by a pitch, but he's good to go for the series opener in Miami. With Contreras back in action, Alec Burleson will shift back to the outfield after drawing his last four starts at first base.

The Brewers optioned Black to Triple-A Nashville on Monday.

Milwaukee promoted Black from Nashville on Friday after Blake Perkins and Isaac Collins were placed on the bereavement list and paternity list, respectively, but the 25-year-old will head back to the minors with both players having since rejoined the Brewers. During his brief stay with the big club, Black didn't make a start but appeared in two of the Brewers' three games in Cincinnati over the weekend, going 0-for-2 with three walks.

Dodgers manager Dave Roberts said that Hernandez (elbow) took part in batting practice Sunday, Fabian Ardaya of The Athletic reports.

Hernandez had been able to take part in baseball activities for more than a week, but being able to take at-bats against live pitching is especially notable, given that swinging the bat had been presenting the most discomfort for him while he attempted to play through his left elbow injury before landing on the shelf July 7. According to Sonja Chen of MLB.com, Hernandez is set to begin a rehab assignment at Triple-A Oklahoma City this week, potentially setting the utility player up for a return from the 10-day injured list before the end of August.

Olson went 1-for-5 with a stolen base in Sunday's win over the Guardians.

It was his first steal of 2025, and only his second in four seasons with Atlanta. Olson is racking up plenty of hits in August, batting .290 (18-for-62) over 16 games, but he's managed just one homer and four RBI over that span. The first baseman's .449 SLG on the year would be the lowest mark of his career over a full season.