Martin Klizan defeated Stan Wawrinka 4-6 6-3 7-5 in the St. Petersburg semi-final on carpet. The upset overturned the form book — Stan Wawrinka came in ranked #110, leading the head-to-head 3–0. Martin Klizan claimed a first win over Stan Wawrinka in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-02-05 | Sofia | R16 | hard | Stan Wawrinka | 4-6 6-2 6-3 |
| 2017-01-16 | Australian Open | R128 | hard | Stan Wawrinka | 4-6 6-4 7-5 4-6 6-4 |
| 2010-04-05 | Casablanca | R16 | clay | Stan Wawrinka | 6-4 0-6 6-4 |
Averages from each player's recent completed matches (20 vs 19). ATP, WTA & Challenger.