Igor Sijsling defeated Yannick Mertens 6-2 6-4 in the M25 Sunderland 1 quarter-final on hard. The result followed the form book — Igor Sijsling came in leading the head-to-head 2–1. Igor Sijsling extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2020-09-19 | M25+H Plaisir 1 | SF | hard | Igor Sijsling | 6-1 7-6(3) |
| 2016-06-27 | Wimbledon | Q3 | grass | Igor Sijsling | 6-3 6-2 7-6 |
| 2009-03-09 | Great Britain F3 | QF | hard | Yannick Mertens | 6-7(3) 7-6(2) 6-2 |
Averages over each player's completed matches in the selected window (40 vs 26). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About