19 by Eddie Murray.
Murray had 19 grand slams in 21 seasons (1977-1997). He hit 16 grand slams for the Baltimore Orioles, 1 for the Los Angeles Dodgers, and 2 for the New York Mets. He is 3rd in MLB career grand slams behind Manny Ramirez (20) and Lou Gehrig (23).
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.
17 grand slams wow
2 grand slams (as on 5 July 2010)
Kenny Rogers gave up 11 grand slams and Nolan Ryan gave up 10 grand slams.
Oh yes he haswon 8 grand slams so far.
Lou Gehrig with 23 grand slams
Andre ethier has hit 2 grand slams so far
who holds the mariners career record for grand slams how many
As of 04AUG09, Albert Pujols has 11 career grand slams. That is the most by any St. Louis Cardinal in history. So far, he has 5 grand slams in the 2009 season.
Alex Rodriguez has hit three grand slams during the 2010 season.
For his entire career he hit 6 grand slams and oddly enough they all were hit in 1987.
Alex Rodriguez hit 3 grand slams during the 2007 season.