Leonardo Mayer defeated Denis Istomin 6-2 6-4 in the New Haven round of 64 on hard. The upset overturned the form book — Denis Istomin came in leading the head-to-head 2–0. Leonardo Mayer claimed a first win over Denis Istomin in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-21 | Nottingham | QF | grass | Denis Istomin | 6-3 6-7(8) 7-6(6) |
| 2010-08-01 | Washington | R64 | hard | Denis Istomin | 6-4 5-7 7-6(5) |
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 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About