BOULDER, Colo. — Sam Darnold tossed two TD passes and ran for another, Ajene Harris intercepted two passes, including one he returned for a score, and No. 15 USC beat Colorado 38-24 on Saturday to wrap up the Pac-12 South title. The Trojans (9-2, 7-1 Pac-12, No. 11 CFP) will play the North winner on Dec.