Martin Klizan defeated Denis Shapovalov 3-6 7-5 6-3 in the St. Petersburg quarter-final on carpet. The upset overturned the form book — Denis Shapovalov came in ranked #42, leading the head-to-head 1–0. Martin Klizan claimed a first win over Denis Shapovalov in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-02-01 | Davis Cup QLS R1: CAN vs SVK | RR | clay | Denis Shapovalov | 7-6(4) 6-4 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.