Steven Diez defeated Alexey Vatutin 6-4 3-6 6-2 in the Braunschweig CH round of 64 on clay. The upset overturned the form book — Alexey Vatutin came in ranked #610, defending last year's round of 32. Steven Diez extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-01-10 | Doha Aus Open Qualies | Q1 | hard | Steven Diez | 6-3 4-6 6-4 |
| 2017-05-01 | Istanbul | Q1 | clay | Alexey Vatutin | 7-6(2) 7-6(7) |
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 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About