The Bucks improved to 4-1 in their last five games behind strong performances from Porter Jr., Portis and Rollins. For Miami, Norman Powell scored 26 points, Bam Adebayo had 18 points and nine rebounds, and Andrew Wiggins added 16.
Milwaukee's Giannis Antetokounmpo missed his 12th consecutive game with a right calf strain, while Miami's Nikola Jovic sat out his second straight game with a back injury. The Bucks host Cleveland on Wednesday while the Heat travel to Philadelphia on Thursday.