Mason Peters
Mason Peters: live stats, tool grades and Baseball Things scouting coverage of the Mariners pitcher.
Mason Peters's 2026 season
Mason Peters made 18 starts in the Seattle Mariners system in 2026, between Single-A Inland Empire and High-A Everett. The left-hander threw 64⅓ innings with a 2.10 ERA, striking out 87 (34.3 percent of batters) and walking 19 (7.5 percent).
Peters opened with Inland Empire and posted a 1.43 ERA in 50⅓ innings before his promotion to High-A Everett on August 13. He posted a 4.50 ERA in 14 innings at High-A.
