Currently, The Yankees Alex Rodriguez and the Royals Yuniesky Betancourt are the major league leaders with three grand slams each in 2010.
In 1987 Don Mattingly hit 6 grand slams. He did not hit another grand slam in his career before or after.
In 2010, the Yankees grand slams were hit by Alex Rodriguez (3), Robinson Cano (2), Jorge Posada (2), Mark Teixeira (1), Curtis Granderson (1) and Brett Gardner (1).
New York Yankees hit 3 Grand Slam in 1 game
Roger Federer: 16 grand slams
2, one by Jose Molina and one by Robinson Cano.
Lou Gehrig, with 23 Grand Slams
two grand slams
Through the 2013 season, there were 6452 grand slams hit in baseball history. The most grand slams in a season happened in the year 2000 when 176 grand slams were hit.
1. Roger Federer [16 grand slams] ... and counting... 2. Pete Sampras [14 grand slams] 3. Bjorn Borg [11 grand slams] 4. Rafael Nadal [10 grand slams] ... and counting...
The New York Yankees hit 3 grand slams in a 22-9 win over the Oakland A's on Thursday, August 25th, 2011.
Currently, the Yankees have hit ten grand slams during the 2010 season. Alex Rodriguez has three, Jorge Posada and Robinson Cano have two each, Curtis Granderson, Mark Teixeira and Brett Gardner have one apiece.