Federico Delbonis defeated Mischa Zverev 6-1 2-6 7-6 in the Madrid Masters round of 64 on clay. The upset overturned the form book — Mischa Zverev came in defending last year's round of 64. Federico Delbonis extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-05-14 | Rome Masters | Q2 | clay | Federico Delbonis | 3-6 6-3 6-4 |
| 2015-10-26 | Valencia | Q1 | hard | Mischa Zverev | 6-2 6-0 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.