Macháč broke for 3-1 and again for 5-1 in a clinical display, sealing it 6-1 with a 3 break point save in a deuce hold for 2-1.
de Minaur broke for 4-4 after saving three break points in a gruelling 8 minute game, then broke again for 6-4 to level the match.
de Minaur broke for 1-1, 3-1 and 5-1 to take the set 6-3, with Macháč salvaging only a break for 2-5 before de Minaur closed it out.