Alex Rodriguez hit a grand slam against the San Francisco Giants on Friday night, breaking a 75-year-old Major League Baseball record.

Rodriguez now stands alone in first place with 24 grand slams, surpassing New York Yankees legend Lou Gehrig. It was the 654th home run of Rodriguez's career.

"You know, that means I'm getting old," the 38-year-old said. "It's hard to think about things like that right now. We're really on a sprint to the end here, and every win is huge for us."

Rodriguez tied Gehrig with 23 career grand slams on June 12, 2012. Gehrig's last grand slam came on Aug. 20, 1938, when he was in his last full season with the Yankees.