John Isner defeated John Millman 7-6 6-7 7-6 in the Acapulco quarter-final on hard. The result followed the form book — John Isner came in leading the head-to-head 3–0, defending last year's round of 32. John Isner extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2020-08-24 | Cincinnati Masters | R32 | hard | John Isner | 4-6 7-6 7-6 |
| 2016-05-23 | Roland Garros | R128 | clay | John Isner | 6-7 7-6 7-6 7-5 |
| 2015-10-05 | Beijing | R16 | hard | John Isner | 4-6 7-6 6-4 |
Averages over each player's completed matches in the selected window (166 vs 192). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About