Donald Young defeated Lukas Lacko 6-4 6-2 6-4 in the US Open round of 128 on hard. The upset overturned the form book — Lukas Lacko came in leading the head-to-head 2–0, defending last year's round of 128, but Donald Young had been the form player, winning 2 of their last 5 on hard. Donald Young claimed a first win over Lukas Lacko in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-07-24 | Atlanta | R16 | hard | Lukas Lacko | 6-3 6-1 |
| 2012-01-16 | Australian Open | R64 | hard | Lukas Lacko | 6-3 6-1 3-6 6-3 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.