American baseball player Harmon Killebrew of the Minnesota Twins poses in the locker room with two baseballs, one labelled 500 and the other 501, after a game against the Baltimore Orioles at Metropolitan Stadium, Bloomington, Minnesota, August 10, 1971. The first ball marks Killebrew's 500th career homerun, he was the 10th major league to reach that achievement, while the other marks a second homer hit during the same game; nevertheless, the Twins lost the game. (Photo by Bruce Bennett Studios via Getty Images Studios/Getty Images)
