Denis Constantin Spiridon defeated Ryuichiro Nakano 6-2 6-0 in the M15 Monastir 13 q64 on hard. The upset overturned the form book — Ryuichiro Nakano came in leading the head-to-head 1–0. Denis Constantin Spiridon claimed a first win over Ryuichiro Nakano in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-03-20 | M15 Monastir 12 | Q32 | hard | Ryuichiro Nakano | 3-6 6-4 10-8 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.