Hall of Fame left-hander Randy Johnson will have his No. 51 retired by the Seattle Mariners during a pregame ceremony on May 2, 2026. Johnson went 130-74 with a 3.42 ERA across 10 seasons with the Mariners. In June, the Mariners announced that Johnson’s No. 51 would become the fifth number retired in franchise history, joining Ken Griffey Jr. (No. 24), Edgar Martinez (No. 11) and Ichiro Suzuki, who had his No. 51 retired this summer. Johnson, who went on to pitch for four other teams, spent nearly half of his 22-year Major League career with Seattle and won his first of five Cy Young awards with the franchise.