Steven Diez defeated Yuichi Sugita 6-2 6-4 in the Kaohsiung CH round of 16 on hard. The upset overturned the form book — Yuichi Sugita came in defending last year's round of 32, but Steven Diez had been the form player, winning 5 of their last 6 on hard. Steven Diez extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-04-24 | Barcelona | Q2 | clay | Steven Diez | 6-4 7-6(7) |
| 2014-08-04 | Canada Masters | Q1 | hard | Yuichi Sugita | 7-6(4) 6-4 |
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 137). ATP, WTA & Challenger.