Hassan Adams' leadership was even more important to Arizona than his solid shooting.
Back from a two-game suspension, Adams scored 21 points and Ivan Radenovic had 18, leading the eighth-seeded Wildcats to a 94-75 victory over ninth-seeded Wisconsin in a Minneapolis Regional game on Friday at Philadelphia.
Playing in his hometown, Mustafa Shakur had 17 points and nine assists, and Arizona advanced behind tough defense and outstanding shooting.
"It was tough last week without Hassan," Wildcat Coach Lute Olson said. "He's a great competitor. The more there is on the line, the better he plays. He's a winner. We need his leadership. It was great to have him back."
Adams sat out two games in the Pacific 10 Conference tournament because the senior was arrested on suspicion of drunk driving. He shot 10 for 14 and played only 23 minutes.
"We were well-prepared," Adams said. "It took us a week to get ready."
Arizona (20-12) shot 59% from the field and will play Sunday against top-seeded Villanova.
Alando Tucker scored 19 and Kammron Taylor had 12 for Wisconsin (19-12). The Badgers finished their season with four consecutive losses.
"We played offensively as well as we played all year," Olson said. "We let the game come to us. We worked to get the open shot and, when we got it, we knocked it down."
Villanova 58, Monmouth 45 -- Allan Ray returned from a scary eye injury to score 19 points, Randy Foye had 17 points and the top-seeded Wildcats (26-4) pulled away from the 16th-seeded Hawks (19-15) at Philadelphia.
Monmouth was led by Dejan Delic, who scored 17 points.
Kyle Lowry made six free throws in the final minutes to keep the Wildcats unbeaten at their off-campus home, the Wachovia Center, where they improved to 4-0 this season.
Ohio State 70, Davidson 62 -- Ron Lewis came off the bench to score 16 of his 19 points in the second half as the second-seeded Buckeyes (26-5) surged past the 15th-seeded Wildcats (20-11) at Dayton, Ohio.
Ian Johnson matched his career high with 26 points and also had 10 rebounds for Davidson.
The Wildcats got as close as 49-46 on Brendan Winters' steal and jumper with 7 1/2 minutes left, but J.J. Sullinger scored on a short jumper and Terence Dials had a three-point play and Ohio State's lead never fell below five points again.
Georgetown 54, Northern Iowa 49 -- Roy Hibbert, a 7-foot-2 center, scored 17 points, and the seventh-seeded Hoyas (22-9) relied on their clampdown defense to defeat the 10th-seeded Panthers (23-10) at Dayton, Ohio.
Northern Iowa had no one to match up with Hibbert, who went eight for 10 from the field and had nine rebounds before fouling out. He also set the tone inside on defense -- the Panthers opened the second half in a two-of-18 shooting slump against the Big East's stingiest defense.
John Little led Northern Iowa with 17 points, including five three-pointers.