Yunseong Chung defeated Yosuke Watanuki 2-6 7-6 6-3 in the Ningbo CH round of 16 on hard. The upset overturned the form book — Yosuke Watanuki came in ranked #416, leading the head-to-head 2–0, defending last year's quarter-final, but Yunseong Chung had been the form player, winning 7 of their last 8 on hard. Yunseong Chung claimed a first win over Yosuke Watanuki in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-08-23 | Winston-Salem | Q1 | hard | Yosuke Watanuki | 6-3 7-6 |
| 2021-08-21 | Winston-Salem | Q16 | hard | Yosuke Watanuki | 6-3 7-6(3) |
Averages over each player's completed matches in the selected window (200 vs 198). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About