Donald Young defeated Stefan Kozlov 6-2 6-2 in the Dallas CH round of 64 on hard. The upset overturned the form book — Stefan Kozlov came in ranked #296, defending last year's round of 64, but Donald Young had been the form player, winning 3 of their last 7 on hard. Donald Young extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-01-04 | Delray Beach | Q2 | hard | Donald Young | 4-6 6-4 6-4 |
| 2017-03-06 | Indian Wells Masters | R128 | hard | Donald Young | 7-5 7-6 |
| 2016-07-11 | Newport | R16 | grass | Donald Young | 6-0 6-4 |
Averages over each player's completed matches in the selected window (71 vs 199). 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