Three grand slams were hit on August 20th 2009: Russell Martin of the Los Angeles Dodgers hit one at home against the Chicago Cubs (the Dodgers went on to win 7-2). Brian Robertsof the Baltimore Orioles hit one on the road against the Tampa Bay Rays (the Orioles won 8-7). Brendan Ryan of the St Louis Cardinals hit one on the road against the San Diego Padres (the Cardinals won 5-1). Also, on July 27th Josh Willingham of the Washington Nationals became only the 13th player in the MLB - and only the 3rd in the National League - to hit two grand slams in the same game, lifting the Nationals to a 14-6 win over the Milwaukee Brewers in Milwaukee.
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Tony Cloninger hit two grandslams on July 3, 1966 against the San Francisco Giants.
Unfortunately, the most recent data I could find was for the 2008 MLB season. In 2008, 124 grand slams were hit (72 in the AL and 52 in the NL) in 2428 total games for an average of 1 grand slam every 19.58 games. The most grand slams hit in an MLB season is 176 (89 in the AL and 87 in the NL) in 2429 games in the 2000 season for an average of 1 grand slam every 13.80 games.
Lou Gehrig hit 23 career grand slam home runs, the most by any player in Major League Baseball history.
23 Career Grand Slams. Lou Gehrig
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Martin Prado. He hit a grand slam Monday, May 10, 2010.
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On July 4, 2011, Milwaukee Brewers pitcher, Shaun Marcum, hit a grand slam against the Arizona Diamondbacks. It was his first Major League home run.
No, Carlos Zambrano did not hit a grand slam in 2008.
Robert Person on June 2, 2002 against the Montreal Expos. He also had a three run home run in that game.
No, actually they did not hit a grand slam in 2009. Very unusual.
Tony Cloninger hit two grandslams on July 3, 1966 against the San Francisco Giants.
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Cal Ripkin Jr. hit first grand slam on July 3, 1994 against the Los Angeles Angels. He hit his second grand slam on June 3, 1995 against the Oakland Athletics. He hit his third grand slam on May 28, 1996 against the Seattle Mariners. He hit his fourth grand slam on May 6, 1997 against the Los Angeles Angels. He hit his final grand slam on June 30, 1997 against the Philadelphia Phillies.
Yes. At the end of last year against the Cleveland Indians
He hit his grand slam off Joe Borowski of the Chicago Cubs on June 18, 2005 at Yankee Stadium.