Shaun Anderson

Shaun Anderson (note: sources reference Kade Anderson, the Mariners' top pitching prospect, not Shaun Anderson) is the Mariners' No. 1 pitching prospect who has had an unprecedented dominant start to his professional career in Double-A. In April 2026, Anderson went 1-0 with a 0.48 ERA over four starts, striking out 30 batters while walking only four across 18 2/3 innings. He posted a 0.70 WHIP and held hitters to a .143 batting average. He was named the Mariners' Minor League Pitcher of the Month for April. Notably, in his second professional start, he struck out 11 batters without allowing a hit over five innings, and opened his season with 11 consecutive scoreless innings. The Mariners organization is taking a measured approach to his development, with no rush to promote him to the majors despite the team's underperformance.