Indianapolis Colts sign University of South Florida rookie RB Marlon Mack

The Indianapolis Colts signed running back Marlon Mack to a contract Wednesday.

Mack, who was a fourth-round selection in last month's draft, is the fifth of eight picks signed by the Colts.

Mack set 14 school records as a three-year starter at South Florida. The 21-year-old finished as the school's all-time leading rusher in yards (3,609), rushing touchdowns (32) as well as all-purpose yards (4,107).

Last season, Mack was named an AAC First-Team selection after rushing 174 times for 1,187 yards and 15 touchdowns. He also had 28 receptions for 227 yards.