
Kei Nishikori defeated Gael Monfils 6-1 3-6 6-3 in the Halle round of 16 on grass. The upset overturned the form book — Gael Monfils came in ranked #325, defending last year's quarter-final. Kei Nishikori extended the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-08-27 | US Open | R64 | hard | Kei Nishikori | 6-2 5-4 RET |
| 2017-08-07 | Canada Masters | R32 | hard | Gael Monfils | 6-7(4) 7-5 7-6(6) |
| 2016-08-08 | Rio Olympics | QF | hard | Kei Nishikori | 7-6(4) 4-6 7-6(6) |
| 2016-03-21 | Miami Masters | QF | hard | Kei Nishikori | 4-6 6-3 7-6(3) |
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 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About