Baseball History · On This Day On This Day: August 10 Posted on August 10, 2019 by Baseballia 1971 Harmon Killebrew of the Minnesota Twins hit his 500th home run in the first inning off Baltimore’s Mike Cuellar to become the 10th player to hit 500 or more in a career. The “Killer” would total 573 dingers in his Hall of Fame career.