John Isner defeated Lukas Lacko 6-4 6-3 in the Delray Beach round of 16 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 16. John Isner extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-07-24 | Atlanta | QF | hard | John Isner | 7-5 6-4 |
| 2014-09-12 | Davis Cup WG PO: USA vs SVK | RR | hard | John Isner | 6-3 6-0 |
| 2014-01-06 | Auckland | R16 | hard | John Isner | 7-6(1) 3-6 6-2 |
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 (164 vs 133). ATP, WTA & Challenger.