John Isner defeated Dusan Lajovic 6-4 6-7 6-3 3-6 7-6 in the USA vs SRB round robin on clay. The result followed the form book — John Isner came in leading the head-to-head 5–1. John Isner extended the head-to-head to 6–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-12 | Cincinnati Masters | R64 | hard | John Isner | 7-6 1-6 7-5 |
| 2018-08-27 | US Open | R32 | hard | John Isner | 7-6 6-7 6-3 7-5 |
| 2017-10-09 | Shanghai Masters | R64 | hard | John Isner | 4-6 7-6 7-6 |
| 2017-06-26 | Eastbourne | R16 | grass | John Isner | 3-6 7-6 7-6 |
| 2016-02-08 | Buenos Aires | R16 | clay | Dusan Lajovic | 7-6 4-6 7-6 |
| 2015-05-17 | Nice | QF | clay | John Isner | 7-6 6-4 |
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
Lajovic D.: 2 days rest · 1 match, 7 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About