While Fernando Tatis remains the only big leaguer to hit two grand slams in an inning, 12 other players have also clubbed a pair of slams in a game.
The Red Sox have been by far the most profilic club in this category, accounting for two of the past three (Bill Mueller in 2003 and Nomar Garciaparra in 1999) two-slam games, and four of the 13 overall.
• Photos: Two grand slams in one game
"You definitely have to get lucky to do that," Robin Ventura told reporters after hitting a pair of grand slams for the White Sox on Sept. 4, 1999. "To have the bases loaded [twice] and do that, it's kind of a freak thing."
The Nationals' Josh Willingham in 2009 was the most recent player to hit two in a game, becoming just the third Natonal Leaguer to accomplish the feat.
The first NL player to do it? Braves pitcher Tony Cloninger in 1963. He's still the only hurler on the impressive list below:
• Josh Willingham, Nationals, July 27, 2009 (fifth and sixth innings) Watch >
• Bill Mueller, Red Sox, July 29, 2003 (seventh and eighth innings) Watch >
• Nomar Garciaparra, Red Sox, May 10, 1999 (first and eighth innings) Watch >
• Fernando Tatis, Cardinals, April 23, 1999 (Both in third inning) Watch >
• Chris Hoiles, Orioles, Aug. 14, 1998 (third and eighth innings) Watch >
• Robin Ventura, White Sox, Sept. 4, 1995 (fourth and fifth innings) Watch >
• Frank Robinson, Orioles, June 26, 1970 (fifth and sixth innings)
• Jim Northrup, Tigers, June 24, 1968 (fifth and sixth innings)
• Tony Cloninger, Braves, July 3, 1966 1, 4 (first and fourth innings)
• Jim Gentile, Orioles, May 9, 1961 (first and second innings)
• Rudy York, Red Sox, July 27, 1946 (second and fifth innings)
• Jim Tabor, Red Sox, July 4, 1939 (third and sixth innings)
• Tony Lazzeri, Yankees, May 24, 1936 (second and fifth innings)