BOSTON, MA—The Boston Red Sox today placed infielder Marcelo Mayer on the 10-Day Injured List with a bone stress reaction to the left ulna. To fill his spot, Boston recalled infielder Tsung-Che Cheng from Triple-A Worcester. Cheng will wear number 39.
Mayer, 23, has played in 70 games for Boston this season, making 39 starts at second base and 20 at shortstop. The left-handed hitter has batted .220 (45-for-205) with 19 runs scored, 10 doubles, three home runs, and 22 RBI. Originally selected by the Red Sox in the first round (No. 4 overall) of the 2021 First-Year Player Draft, the California native has hit .223 (74-for-332) in 114 career Major League games, all with Boston (2025-26).
Cheng, 24, has batted .254 (52-for-205) with 34 runs scored in 64 games for Worcester this season, making 37 starts at shortstop and 23 at second base. The left-handed hitter made his Major League debut in 2025 with the Pittsburgh Pirates, appearing in three games. A native of Taiwan, he was claimed by Boston off waivers from the Washington Nationals on February 6, 2026.