Hayden Mullins

Hayden Mullins's 2026 season

Hayden Mullins made 23 appearances, 21 of them starts, in the Boston Red Sox system in 2026, between Double-A Portland Sea and Triple-A Worcester Red. The left-hander threw 95⅔ innings with a 3.95 ERA, striking out 135 (33.0 percent of batters) and walking 53 (13.0 percent).

Mullins opened with Portland Sea and posted a 3.98 ERA in 92⅔ innings before his promotion to Triple-A Worcester Red on July 8. He reached Triple-A at 25, two years younger than the average International League pitcher, and posted a 3.00 ERA in 3 innings there.