Manager Alex Cora said Friday that Mayer will get the majority of the playing time at second base moving forward, Mac Cerullo of the Boston Herald reports.

The 22-year-old's roster spot appeared in question with Alex Bregman (quadriceps) returning from the injured list Friday, but the Red Sox will keep Mayer in the majors and shift him to the middle infield. The rookie has seen most of his playing time thus far at the hot corner, but he has yet to get on track at the plate with a .234/.272/.421 slash line and 29.8 percent strikeout rate through 37 games. Mayer is starting at the keystone and batting seventh Friday versus the Rays.

The Red Sox reinstated Bregman (quadriceps) from the 10-day injured list Friday, Tim Healey of The Boston Globe reports.

The veteran third baseman will join the Red Sox to face the Rays this weekend for the final series before the All-Star break. Bregman missed seven weeks due to a quadriceps strain but is back without having gone on a rehab assignment, and he's expected to start two of Boston's final three games of the first half. He's at third base and batting second Friday.

Rojas isn't part of the starting lineup for the first game of Friday's doubleheader against the Guardians.

Rojas will dodge a same-handed matchup against southpaw Logan Allen in Friday's matinee. Instead, Miguel Vargas will slot in at third base while Tim Elko plays first base.

Mayer will remain on the Red Sox roster after the team optioned David Hamilton to Triple-A Worcester on Thursday to clear a spot for Alex Bregman (quadriceps), Chris Cotillo of MassLive.com reports.

Bregman's return Friday was going to present a roster crunch, but it's Mayer who will stay in the majors. The 22-year-old top prospect will likely occupy the strong side of a platoon at second base with Romy Gonzalez. Mayer had a key run-scoring double Thursday during Boston's three-run seventh inning.

Bregman (quadriceps) is expected to be activated from the 10-day injured list ahead of Friday's game against the Rays, Chris Cotillo of MassLive.com reports.

All signs point to Bregman's return Friday, including the team's decision to option David Hamilton to Triple-A Worcester following Thursday's series-opening 4-3 win over Tampa Bay. The team hedged for a few days as to whether Bregman would be activated, but manager Alex Cora said Thursday that the injured infielder would start two of the three remaining games against the Rays. It makes sense that Bregman would play Friday and Sunday with a day off Saturday.

Red Sox manager Alex Cora confirmed Thursday that Bregman (quadriceps) will be activated from the 10-day injured list this weekend, Ian Browne of MLB.com reports.

Cora added that Bregman will be in the lineup for two of the final three games of a four-game set against the Rays, although the skipper didn't specify which games it would be. Bregman has been sidelined since late May due to a strained right quad and will rejoin the active roster without a rehab assignment.

Williamson isn't in the lineup for Thursday's game against the Yankees.

Williamson will take a seat Thursday after collecting a base hit in each of the first two games of the series. Miles Mastrobuoni will fill in as Seattle's third baseman and bat ninth.

Peraza isn't in the lineup for Thursday's game against the Mariners.

Peraza will give way to Jorbit Vivas at the hot corner Thursday after going 1-for-8 with an RBI, a run and two strikeouts over the first two games of the series.

Caminero went 2-for-5 with a solo home run and a second run scored in Wednesday's 7-3 win over the Tigers.

Just named to his first All-Star Game, Caminero wrapped up the scoring on the night by clobbering a Chase Lee sweeper to lead off the seventh inning. The 22-year-old third baseman is up to 22 homers on the season, including five in his last 16 games, but he's otherwise in a bit of a rut and is slashing .224/.239/.493 over that stretch with a 2:18 BB:K.

Ramirez went 2-for-4 with a solo home run, an additional run scored and a stolen base in Wednesday's 4-2 win over Houston.

Ramirez hit the second of back-to-back home runs in the first inning. It was the third consecutive game that he's gone deep. He later was part of a double steal in the seventh that put him in position to score the Guardians' third run. Ramirez is up to 17 home runs and 25 steals through 88 games.