Dominik Koepfer defeated Jonathan Chang 7-5 6-2 in the USA F21 qualifying round of 16 on hard. The upset overturned the form book — Jonathan Chang came in leading the head-to-head 1–0, but Dominik Koepfer had been the form player, winning 4 of their last 7 on hard. Dominik Koepfer claimed a first win over Jonathan Chang in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-18 | USA F24 | R16 | hard | Jonathan Chang | 6-7(3) 6-2 7-5 |
Averages over each player's completed matches in the selected window (200 vs 19). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About