Mayer was promoted to Double-A Portland on Sunday, Chris Cotillo of The Springfield Republican reports.

Mayer went 4-for-4 with two doubles, a home run, two RBI and two additional runs scored for High-A Greenville on Sunday.

Mayer went 3-for-5 with a home run and four RBI in Saturday's game for High-A Greenville.

Mayer finished the season at High-A Greenville by going 14-for-31 (.452) with a homer, a steal and a 7:7 BB:K through his final eight games. Overall, he batted .265/.379/.449 with four homers in 25 games following his promotion.

Red Sox farm director Brian Abraham confirmed Monday that Mayer has been promoted from Single-A Salem to High-A Greenville, Alex Speier of The Boston Globe reports.

Mayer (back) went 3-for-5 with a home run, two walks and a stolen base in two games for Single-A Salem since he exited Sunday's game against Delmarva.

Mayer was removed from the first game of a doubleheader at Single-A Salem due to low-back tightness, Jen McCaffrey of The Athletic reports.

Mayer (wrist) returned from the injured list and went 1-for-3 with a walk, a double, an RBI and a run scored for Single-A Salem on Monday.

Mayer (wrist) was placed on the 7-day minor-league injured list Sunday, Alex Speier of The Boston Globe reports.

Mayer (wrist) started at shortstop and went 3-for-6 with three doubles and two RBI on Sunday in Single-A Salem's 8-7 loss to Delmarva.

Mayer continues to deal with right wrist soreness and will miss a fourth consecutive game for Single-A Salem on Saturday, Steve Hewitt of the Boston Herald reports.

Mayer (wrist) served as Single-A Salem's designated hitter in Tuesday's 1-0 win over Delmarva and went 1-for-4 with his fourth stolen base of the season.

Mayer (wrist) is expected to return to game action sometime this week, Chris Hatfield of Sox Prospects reports.

Mayer has missed a week of action with a sore right wrist, Alex Speier of the Boston Globe reports.

Mayer picked up five plate appearances for the Red Sox this spring, going 0-for-4 with a walk and two strikeouts.

Mayer went 2-for-6 with a home run, four RBI and an additional run scored for the Florida Complex League Red Sox on Saturday.

Mayer went 0-for-1 with three walks for the FCL Red Sox on Thursday.

Mayer agreed to a contract Thursday with the Red Sox that contains a $6.66 million signing bonus, Chad Jennings of The Athletic reports.

The Red Sox have selected Mayer with the fourth overall pick in the 2021 first-year player draft.