Rina Saigo defeated Sohyun Park 2-6 5-0 in the W100 Takasaki round of 16 on hard. The upset overturned the form book — Sohyun Park came in leading the head-to-head 4–0, defending last year's round of 16. Rina Saigo claimed a first win over Sohyun Park in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-06-27 | W35 Taipei 2 | QF | hard | Sohyun Park | 6-3 6-0 |
| 2025-05-22 | W35 Andong 1 | R16 | hard | Sohyun Park | 6-4 6-2 |
| 2025-03-19 | W50 Kofu 1 | R32 | hard | Sohyun Park | 6-2 6-3 |
| 2023-04-05 | W25 Kashiwa | R32 | hard | Sohyun Park | 6-4 6-2 |
Averages over each player's completed matches in the selected window (32 vs 24). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About