MILWAUKEE — Isaiah Thomas had 37 points, and Jae Crowder scored four of his 20 points on free throws in the final 28 seconds of overtime to help the Boston Celtics beat the Milwaukee Bucks 112-108 on Saturday night.

Boston won its third straight after squandering a 16-point second-half lead and a 42-point first quarter, its best of the season.

Giannis Antetokounmpo led Milwaukee with 21 points, and Greg Monroe had 14 points and 13 rebounds. The Bucks have lost three in a row and eight of nine.

Boston built a six-point lead in overtime, but Tony Snell hit consecutive 3s to tie it at 108. Crowder made two free throws on the ensuing possession with 28 seconds to go and two more to seal it with 10 seconds left after Antetokounmpo missed a contested shot in the lane.

The Bucks trailed 69-53 early in the third quarter but took the lead briefly with just under 5 minutes to play on a three-point play by Monroe, who scored 10 points in the fourth quarter. Thomas answered with a 3 and the Bucks couldn’t tie it again until Monroe hit the first of two free throws with 37 seconds to play to make it 102-102.

Thomas then turned the ball over and Milwaukee’s Jabari Parker returned the favor before Thomas missed an off-balance 3-point attempt, and Jaylen Brown’s follow wouldn’t go at the buzzer.

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TIP-INS

Celtics: Thomas has scored 20 or more in 31 straight games and 30 or more 16 times this season. … Celtics center Al Horford (sore groin) did not travel with the team. Guard Avery Bradley (sore right Achilles’ tendon) missed his sixth straight game. … Gerald Green’s 3-pointer at the end of the first quarter gave Boston a 42-27 lead.

Bucks: Parker had a tough night, going 2 for 13 from the field and finishing with four points. … First-round draft pick Thon Maker made his second career start in place of center Miles Plumlee. … It was the first game this season between these two teams. They’ll play twice more, in Boston on March 29 and April 12.

UP NEXT

Celtics: Host Detroit on Monday night to begin a four-game homestand.

Bucks: Visit Utah on Wednesday night to start a three-game Western Conference trip.