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.

Lowe and the Red Sox agreed to a one-year contract Sunday, Jeff Passan of ESPN.com reports.

Lowe was granted his release from the Nationals on Saturday and has quicly found a new home in Boston. The 30-year-old had slashed .216/.292/.373 slash line with 16 home runs and one stolen base over 119 contests with Washington, where he had been handling an everyday role at first base. The Red Sox have struggled to find a consistent option at first base this season, and the left-handed-hitting Lowe could occupy the strong side of a platoon at the position with the right-handed-hitting Romy Gonzalez. Lowe owns a .732 OPS over 337 plate appearances versus right-handed pitching this season.

Guerrero went 2-for-4 with a solo home run during Sunday's 10-4 loss to Texas.

The Blue Jays batters were held in check for the most part by Nathan Eovaldi through seven innings, though Guerrero was able to break through with a solo shot to left-center field for his 21st homer of the season and sixth since the beginning of August. Guerrero has seen his numbers creep up with every passing month, and since the All-Star break he has slashed .368/.442/.702 with 11 doubles, 24 runs, nine home runs and 22 RBI over 129 plate appearances.

Manager Bruce Bochy said that Burger won't be available for at least a couple of days while he heads back to Texas to receive medical imaging on his left wrist, Shawn McFarland of The Dallas Morning News reports.

Burger exited Sunday's 10-4 win over the Blue Jays due to left wrist discomfort, and there's enough concern about his injury for him to leave the team for a more thorough evaluation. The 29-year-old will miss at least the first couple games of the Rangers' upcoming series in Kansas City while the specifics of the injury are determined.

Burger was removed from Sunday's game against the Royals due to left wrist discomfort, Shawn McFarland of The Dallas Morning News reports.

Burger went 1-for-3 with an RBI and a run scored before being replaced by a pinch hitter during the seventh inning. The severity of the injury remains unclear, so the first baseman should be considered day-to-day heading into Monday's series opener in Kansas City.

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

Mountcastle started all eight games since coming off the injured list last week and has slugged two home runs and has posted a .851 OPS, but he'll take a seat for the series finale in Houston. Coby Mayo will continue to man first base for Baltimore, while top prospect Samuel Basallo is making his MLB debut at designated hitter.

Walker is out of the lineup for Sunday's game against the Orioles, Brian McTaggart of MLB.com reports.

It's a rare off day for Walker, who started the previous 30 games after spending a few days on the paternity list in early July. The first baseman is batting just .216 (11-for-51) in August but has four doubles, three homers and a 9:14 BB:K.

Goldschmidt (knee) will start at first base and bat sixth Sunday against the Cardinals.

Goldschmidt has been battling a knee sprain, but he'll return to the lineup for the first time since Tuesday. The veteran first baseman has a .716 OPS through 11 games in August, though he's gone just 3-for-24 outside of a three-hit performance Aug. 4 in Miami.