Tony Cloninger hit two grandslams on July 3, 1966 against the San Francisco Giants.
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The last grand slam hit by a Reds pitcher was by Bob Purkey on August 1, 1959 off of John Buzhardt of the Chicago Cubs.
On July 3, 1966, pitcher Tony Cloninger hit two grand slams in a game against the San Francisco Giants.
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.
1) Tony Lazzeri of the New York Yankees on May 24, 1936. 2) Frank Robinson of the Baltimore Orioles on June 26, 1970.
Nolan Ryan gave up 10 grand slams during his career to hold the MLB record.
Lou Gehrig, who played first base for the New York Yankees between 1923-1939, holds the all time MLB grand slam record with 23. Alex Rodriguez tied Lou Gehrig's Record of 23 Grand Slams on June 12th 2012. Alex Rodriguez broke the record in 2013, with his 24th Grand Slam.
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.