John Isner defeated Hyeon Chung 6-1 6-4 in the Miami Masters quarter-final on hard. The result followed the form book — John Isner came in leading the head-to-head 2–1, defending last year's round of 32. John Isner extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-01-08 | Auckland | R16 | hard | Hyeon Chung | 7-6(3) 5-7 6-2 |
| 2017-08-28 | US Open | R64 | hard | John Isner | 6-3 6-4 7-5 |
| 2016-04-04 | Houston | QF | clay | John Isner | 7-6(5) 6-4 |
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 136). ATP, WTA & Challenger.