Daniel Nguyen defeated Raymond Sarmiento 3-6 7-6 6-2 in the Seoul CH qualifying round 2 on hard. The upset overturned the form book — Raymond Sarmiento came in leading the head-to-head 1–0, but Daniel Nguyen had been the form player, winning 5 of their last 10 on hard. Daniel Nguyen claimed a first win over Raymond Sarmiento in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-19 | Winston-Salem | Q2 | hard | Raymond Sarmiento | 6-2 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 (68 vs 71). ATP, WTA & Challenger.