Here is a list of San Francisco Giants players and personnel who have worn No. 21 since 1958:
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It was worn by Felipe Alou, who was the manager of the Giants from 2003 to 2006. Alou also wore the number for most of his career as a Giants player in the late 1950s and early 1960s.
Jake Dunning wore No. 51 with the San Francisco Giants.
Sergio Romo wore No. 54 for the San Francisco Giants.
Pitcher Manny Aybar wore No. 64 during the 2002 season.
Adam Duvall wore No. 37 when he played with the San Francisco Giants during the 2014 season.
Jeremy Affeldt wore No. 41 during his career with the San Francisco Giants (2009-2015)..