Marius Copil defeated Gilles Muller 6-4 6-4 in the Sofia quarter-final on hard. The upset overturned the form book — Gilles Muller came in leading the head-to-head 1–0, defending last year's quarter-final. Marius Copil claimed a first win over Gilles Muller in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-08 | s Hertogenbosch | QF | grass | Gilles Muller | 7-6(4) 6-1 |
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 29). ATP, WTA & Challenger.