Nobody, it was Jackie Robinson, whose number was retired throughout Baseball in 1997. The only player who still wears #42 is Mariano Rivera, The New York Yankees closer, who had the number before it was retired.
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Here is a list of San Francisco Giants coaches and players who wore No. 42 between 1958 and 2005:
Kirk Reuter was the last member of the Giants franchise to wear No. 42 as an active player. The number has been retired throughout Major League Baseball in honor of baseball great Jackie Robinson.
Here is a list of San Francisco Giants coaches and players who have worn No. 43 since 1958:
Hall of Fame pitcher Bruce Sutter ... Sutter wore #42 for the Cardinals from 1981-1984.