Steven Diez defeated Alexander Bublik 6-4 6-4 in the Canada Masters qualifying round 1 on hard. The upset overturned the form book — Alexander Bublik came in ranked #11. Steven Diez extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-08-05 | Canada Masters | Q1 | hard | Steven Diez | 6-4 6-4 |
| 2019-06-24 | Eastbourne | Q1 | grass | Alexander Bublik | 4-6 6-0 6-3 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.