Julian Reister defeated Denis Istomin 6-3 6-4 in the Hamburg round of 64 on clay. The upset overturned the form book — Denis Istomin came in leading the head-to-head 2–0, defending last year's quarter-final. Julian Reister claimed a first win over Denis Istomin in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-06-23 | Wimbledon | R64 | grass | Denis Istomin | 7-6(7) 6-4 6-4 |
| 2010-07-19 | Hamburg | R16 | clay | Denis Istomin | 3-6 6-3 7-6(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 (74 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About