Gilles Simon defeated John Millman 7-5 3-6 7-6 in the Sydney quarter-final on hard. The upset overturned the form book — John Millman came in leading the head-to-head 1–0, defending last year's round of 16. Gilles Simon claimed a first win over John Millman in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2020-11-09 | Sofia | R16 | hard | John Millman | 7-5 6-7(3) 6-2 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.