Guy Den Heijer defeated Leopold Zima 6-3 6-0 in the M15 Heraklion 8 round of 32 on hard. The upset overturned the form book — Leopold Zima came in leading the head-to-head 1–0. Guy Den Heijer claimed a first win over Leopold Zima in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-02-01 | M15 Antalya 5 | Q64 | clay | Leopold Zima | 6-4 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.