Rajon Rondo had 17 points and 11 assists for the Celtics.
Frank Kaminsky had 28 points and 11 rebounds for Wisconsin, rallying the Badgers to a 64-63 overtime victory against Arizona to advance to the Final Four.
Scottie Wilbekin scored 14 of his 23 points in the first half as Florida became the first team to advance to the Final Four with a 62-52 win over the 11th-seeded Dayton Flyers.
Aaron Harrison hit a 3-pointer for the go-ahead score with 39 seconds left and Julius Randle made a pair of clutch free throws to lift Kentucky to a 74-69 victory over their in-state rivals.
Branden Dawson had 24 points and 10 rebounds as Michigan State beat top-seeded Virginia 61-59 to advance to East Regional final.
Jerryd Bayless led the Celtics in scoring with 20 points, 14 coming in the fourth quarter.
Arizona rallied to beat San Diego State 70-64 Thursday night and advance to the final eight of the NCAA tournament.
Fourth-seeded Michigan State fended off a wild Harvard rally Saturday for an 80-73 victory in the NCAA tournament.
Harvard is making its third straight trip to the tournament after winning the Ivy League.
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