who has hit the most grand slams in mlb history
Grand slam (baseball) Alex Rodriguez has 25 career grand slams, the most by any player in Major League Baseball history, passing Lou Gehrig's 23 on September 20, 2013. Meanwhile, Don Mattingly set the one-season record with six grand slams in 1987 â€“ remarkably, the only grand slams of his major league career. Travis Hafner tied Mattingly's Major League record in 2006, while in 2009, Albert Pujols tied the one-season National League record of five grand slams set by Ernie Banks in 1955.[2]