Derrick Williams scored 21 points as No. 22 Arizona took sole possession of first place in the Pac-10 with a 78-69 victory over host Stanford on Thursday night.

Lamont Jones, the Pac-10 Player of the Week, added 15 points for the Wildcats (19-4, 8-2 Pac-10), who held on for their seventh win in eight games.

Jeremy Green scored 21 points and Josh Owens had 13 points and nine rebounds for Stanford (11-10, 4-6 Pac-10).

Whenever Arizona needed a big play, Williams’ number was called. He had six points and two rebounds in the final minutes after Stanford tied the game 60-60 with 4:17 to go.

The Cardinal stormed out the gate to start the second half with a 12-1 run to take a 45-40 lead with 14:15 to play. Williams responded for Arizona with a putback that fueled a 9-0 run.

Stanford, which prides itself on defense, couldn’t contain Arizona's high-powered attack. Four Wildcats scored in double figures as the Cardinal allowed more than 70 points for the first time in 11 games.