24 - Ken Griffey Jr.
- Ken Griffey Jr. was elected to the National Baseball Hall of Fame on Wednesday, Jan. 6, 2016 along with Mike Piazza, becoming members 311 and 312 of the Cooperstown shrine.
- Griffey and Piazza were inducted on July 24 in Cooperstown as the Class of 2016 as part of the July 22-25 Hall of Fame Weekend.
- Griffey, in his first year on the Baseball Writers' Association of America ballot, was named on 437 of 440 ballots by voting members of the BBWAA, setting a new record with a percentage of 99.32.
- On August 6, 2016, Griffey's No. 24 was retired by the Mariners and hung on the center-field façade next to Jackie Robinson's 42 at Safeco Field.
- Griffey became the first Mariner ever to have his number retired by the organization.
42 - Jackie Robinson
- In 1947, Jackie Robinson became the first African American man to play in the Major Leagues.
- Number retired throughout baseball in 1997.
- Played for Brooklyn Dodgers from 1947-56.
- From his Baseball of Hame Plaque: "Leading NL batter in 1949. Holds fielding mark for second baseman playing in 150 or more games with .992. Led NL in stolen bases in 1947 and 1949. Most Valuable Player in 1949. Lifetime batting average .311. Joint record holder for most double plays by second baseman, 137 in 1951. Led second baseman in double plays 1949-52."
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