Jiri Barnat defeated Piotr Grynkowski 6-3 6-3 in the M25 Lodz 1 round of 32 on clay. The upset overturned the form book — Piotr Grynkowski came in leading the head-to-head 2–0. Jiri Barnat claimed a first win over Piotr Grynkowski in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2020-02-24 | M15 Trnava 1 | Q32 | hard | Piotr Grynkowski | 6-3 6-2 |
| 2019-11-12 | M15 Milovice 1 | Q16 | hard | Piotr Grynkowski | 6-4 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.