Marcus Willis defeated Jacob Adaktusson 6-1 3-6 6-4 in the Greece F20 round of 16 on hard. The upset overturned the form book — Jacob Adaktusson came in leading the head-to-head 1–0. Marcus Willis claimed a first win over Jacob Adaktusson in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-09-21 | Sweden F4 | R32 | hard | Jacob Adaktusson | 6-4 2-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.