The Pacers led by 11 points in the first half but had just eight points in the third quarter. Reggie Jackson added 12 points and five assists. Antetokounmpo and Lopez had 14 points apiece and Hill scored 13.
Milwaukee's advantage reached 30 just 26 seconds into the second half when Brown made a 3-pointer.
'What I didn't understand was an official coming over and having a conversation with a player that's not even playing and giving him a technical, ' Casey said.
Griffin will be listed as day to day for the remainder of the series, with a league source calling it a "slim chance" he plays this weekend. Kennard's 15 points led the Pistons.
Drummond got the defensive assignment on Antetokounmpo after Thon Maker got in early foul trouble trying to stop him. He avoided a flagrant foul when he brought Antetokounmpo to the floor in the second quarter.
The Bucks swept the Pistons in the regular season, despite Griffin's averaging 24.3 points in those four meetings.
But the task got more hard with leading scorer Blake Griffin being ruled out of Game 1 due to a sore knee that bothered him in the waning days of the regular season, and the Bucks took full advantage of Griffin's absence. Budenholzer said he was concerned about the rebounding battle and going against league-leading rebounder Drummond (15.6 per game). They scored 77 against Philadelphia in the Eastern Division semifinals in March 1970.