INDIANAPOLIS — Rick Pitino enjoyed watching last night's game almost as much as his Louisville players enjoyed celebrating.

Fun-loving forward Terrence Williams danced on the sideline. Guard Edgar Sosa posed for the television camera. Even backup Kyle Kuric dunked. For the top-seeded team in the NCAA tournament, this was more fun than a team scrimmage or a pickup game.

Earl Clark scored 19 points and had nine rebounds and the Cardinals delivered one of the most crushing blowouts in regional history with a 103-64 victory over Arizona.

"We played great tonight because we really passed the ball beautifully," Pitino said. "It's fun as a coach to watch the guys be so unselfish."

Should they follow the same script tomorrow, against second-seeded Michigan State in the Midwest final, the Cardinals (31-5) will return to the Fin0al Four for the first time since 2005. The Spartans beat Kansas, the defending champs, 67-62 in the second semifinal game.

But if they play like this, they could fulfill another goal: Winning their third national championship.

The Big East now has four teams playing in this weekend's regional finals, including its regular-season and tournament champ, Louisville. Pitino improved to 9-0 all-time in the regional semifinals.

For Arizona (21-14), the lowest seed to reach the semis at No. 12, it was an embarrassing end to a turbulent season. There was a coaching change in October, a 2-5 start in Pac-10 play and the Wildcats lost five of their last six regular-season games, putting the nation's longest active streak of consecutive tourney appearances in jeopardy.

Yet the committee still took them, for the 25th straight year, as one of the final at-large teams in the 65-team field.

MICHIGAN STATE 67, KANSAS 62

Big Ten player of the year Kalin Lucas couldn't shoot straight for 39 minutes. He made up for those misses in a hurry.

Lucas scored seven points in the final 49 seconds, including 5-for-5 on free throws, to help the second-seeded Spartans (29-6) rally past the defending national champion and third-seeded Jayhawks (27-7).

"You know, I think the type of person Kalin is, when he gets another big-time guard, he wants to kind of prove himself to the nation," Michigan State guard Travis Walton said. "Today, I think he took it personal."

Kansas led 60-57 when Michigan State's Durrell Summers made the first of two free throws, and the Spartans came up with the offensive rebound when he missed the second. Raymar Morgan, who hadn't made a basket the entire game, dunked to tie it at 60 with 1:46 to play.

On Michigan State's next possession, Lucas spun, pump-faked in the lane, drew contact from Collins, then dropped in a shot. He made the free throw to put the Spartans ahead for good, 63-60, with 48 seconds left.