Willie McCovey's 1959 season started with him hitting 29 homers for the Giants' AAA team in Phoenix. In late July he was brought up to the Giants where he hit .354 with 13 homers in just 52 games. He was the unanimous winner of the N.L. Rookie of the Year.
The Giants already had 1958 Rookie of the Year, Orlando Cepeda, at first base but had to make room for McCovey so they sent Cepeda to the outfield. Over the next several seasons both natural firstbasemen would have all-star seasons in the outfield as well as at first for the Giants.