Answered June 14th, 2020

Willie Mays hit .347 when collecting 54+ RBI with 15+ home runs and when stealing 24+ bases in 1958.

.346 ba, 15 hr, 54 rbi, 24 sb in a season by a player since 1950
Interpreted as:
.346 or higher ba, 15 or more hr, 54 or more rbi, 24 or more sb in a season by a player since 1950

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