Adam Chadaj defeated Piotr Matuszewski 6-1 6-4 in the Poland F6 qualifying round on clay. The upset overturned the form book — Piotr Matuszewski came in leading the head-to-head 1–0. Adam Chadaj claimed a first win over Piotr Matuszewski in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-05-21 | Poland F4 | R32 | clay | Piotr Matuszewski | 1-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.