John Isner defeated Horacio Zeballos 6-7 6-4 6-2 in the Houston round of 16 on clay. The result followed the form book — John Isner came in leading the head-to-head 3–0, defending last year's quarter-final. John Isner extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-05-28 | Roland Garros | R64 | clay | John Isner | 6-7(8) 7-6(4) 7-6(2) 6-2 |
| 2011-04-04 | Houston | R16 | clay | John Isner | 7-5 6-3 |
| 2010-04-25 | Rome Masters | R64 | clay | John Isner | 4-6 7-6(5) 7-5 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About