Nine by Tony Cloninger of the Atlanta Braves on July 3, 1966 against the San Francisco Giants. Cloninger hit two grand slams and a single to account for the 9 RBIs.
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Honus Wagner with 1732 RBI
As of the 2008 season, the record is 9 and is held by pitcher Tony Cloninger who hit 2 grand slams in a game against the San Francisco Giants on July 3, 1966.
Tony Cloninger set a major league record for RBIs by a pitcher with 2 grand slams and an RBI single for the Atlanta Braves in a 17-3 win over the San Francisco Giants on July 3, 1966.
jeff Kent had the most at the position 2nd base, yet Rogers Hornsby retired with the most RBI's, but not by much
Randy Johnson - 19