In a 12-3 rout of their West Coast rival, Willie Mays homers twice against the Dodgers in the LA Memorial Coliseum contest. The ‘Say Hey Kid’s’ second round-tripper, a fifth-inning shot off Ed Roebuck, is the first grand slam ever hit by a San Francisco Giant.

On May 12, 1958 — In a 12-3 rout of their West Coast rival, Willie Mays homers twice against the Dodgers in the LA Memorial Coliseum contest. The ‘Say Hey Kid’s’ second round-tripper, a fifth-inning shot off Ed Roebuck, is the first grand slam ever hit by a San Francisco Giant.

Sources:
National Pastime

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