The Heat suffered a disappointing loss to the Bucks on Saturday night, leading to a host of boos from their home crowd.
"I hope it don't get no worse than this," forward Michael Beasley said. "This feels bad. You can only work hard from here and just pray it don't get no worse for us from here."
The Heat have now fallen below .500 (29-30) and they are 0-3 against the Bucks this season.
"I never said it was going to be easy," coach Erik Spoelstra said. "We did what we could this week. This was a bad game. This was a bad matchup. In the second half, it became a confidence issue."
Miami has been without Dwyane Wade for their last four games.