LAS VEGAS — Bennie Boatwright had 22 points and 11 rebounds, helping Southern California roll over Arizona 78-65 in the opening round of the Pac-12 tournament on Wednesday. The No. 8 seed Trojans (16-16) started slowly, but went on 18-2 runs in each half to earn a spot in Thursday’s quarterfinals against top-seeded Washington. Derryck
