The Celtics were up 108-106 in overtime when Al Horford collected a rebound and got it ahead to Rozier, who was fouled.
Middleton ended the game second behind Giannis Antetokounmpo with 31 points, eight rebounds and five assists.
After the Bucks hit a 3-pointer to tie the game with just seconds remaining, Terry Rozier appeared to play the role of hero for Boston when he put a attractive move on a defender and knocked down a three of his own.
The NBA Playoffs officially begin later today, but the Boston Celtics won't begin their first-round series of the postseason until they host the Milwaukee Bucks at the TD Garden tomorrow. The Bucks star dropped 29 points and pulled down 11 rebounds the last time the teams met in the regular season, and the Celtics will need to find ways to slow down his bull rushes to the rim.
However, the Bucks had one last possession, and Khris Middleton wasn't going to let his team go out like that.
Sheikh Mohammed bin Rashid leaves for Arab Summit in Saudi Arabia
Minister Awad who reached Saudi Arabia on Thursday attended the preparatory meeting on Friday ahead of the Summit. Saudi Arabia is pushing for a tough, unified stance against its regional arch-rival Iran.
Malcolm Brogdon: He was Milwaukee's most effective scorer off the bench on Sunday.
Jayson Tatum: This was a strong playoff debut by the 20-year-old rookie, finishing with 19 points on 8-for-18 shooting as part of a double-double that included 10 rebounds which made him just the third Celtics rookie all-time to tally a double-double in their first playoff game.
Horford's 24 points and 12 rebounds were both team-highs.
Eric Bledsoe: The Bucks didn't get almost enough impactful plays from Bledsoe who had just nine points on 4-for-12 shooting before fouling out.
Check it out. The ball just got off his fingertips.
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