LAGUNA NIGEL, Calif. — The ball Alex Rodriguez hit for his 500th home run will be auctioned off online.

SCP Auctions said bidding will begin Jan. 20 for the ball recovered by a college student at the old Yankee Stadium when A-Rod hit No. 500 on Aug. 4, 2007.

SCP also sold the balls Barry Bonds hit for his 755 and 756th home runs.