Triolo went 0-for-1 with three walks, a steal and one run scored in Monday's 5-2 victory over the Blue Jays.

Triolo pilfered his eighth base of the season when he stole second off Blue Jays reliever Yariel Rodriguez in the sixth. The Pittsburgh infielder has become a staple of the starting lineup since Ke'Bryan Hayes was shipped out at the trade deadline, as he garnered his eighth consecutive start at shortstop. Triolo has made the most of his opportunity, hitting .274 (14-for-51) with three steals, nine runs scored, three RBI and 9:12 BB:K across 16 games this month.

Guerrero (hamstring) will undergo an MRI on Monday night, Keegan Matheson of MLB.com reports.

This should help the club determine next steps for the slugger, who exited Monday's game early with left hamstring tightness. Matheson notes that Guerrero's removal may have been precautionary, though the team won't know for sure until viewing his scans.

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.