Khachanov broke for 3-2 and again for 5-2 in a 7 minute deuce game, then held for 6-2, overwhelming Macháč despite Macháč saving all break points in a deuce hold for 1-0.
Macháč broke Khachanov for 6-4 in a 6 minute deuce game, saving the set after both players held serve throughout, with Khachanov saving two of three break points before being broken.
Khachanov held for 6-6 in a 10 minute deuce game saving all four break points, then won the tiebreak in 11 minutes after Macháč held for 6-5, a gruelling set that went the distance.