John Isner defeated Viktor Troicki 7-6 7-6 in the Monte Carlo Masters round of 32 on clay. The upset overturned the form book — Viktor Troicki came in leading the head-to-head 5–2. John Isner narrowed the head-to-head to 5–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-10-09 | Shanghai Masters | R16 | hard | Viktor Troicki | 6-4 7-6(4) |
| 2017-08-14 | Cincinnati Masters | R64 | hard | John Isner | 7-6(3) 6-4 |
| 2015-06-15 | Queen's Club | QF | grass | Viktor Troicki | 7-6(5) 6-3 |
| 2011-08-08 | Canada Masters | R32 | hard | Viktor Troicki | 6-4 3-6 6-2 |
| 2011-07-31 | Washington | QF | hard | John Isner | 7-6(5) 3-6 6-1 |
| 2010-03-05 | Davis Cup WG R1: SRB vs USA | RR | clay | Viktor Troicki | 7-6(4) 6-7(5) 7-5 6-4 |
| 2009-09-28 | Bangkok | QF | hard | Viktor Troicki | 7-6(3) 6-2 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.