Rina Saigo defeated Yeon Woo Ku 2-6 6-2 6-4 in the W35 Roehampton 1 round of 16 on hard. The upset overturned the form book — Yeon Woo Ku came in ranked #176, leading the head-to-head 5–0, but Rina Saigo had been the form player, winning 8 of their last 9 on hard. Rina Saigo claimed a first win over Yeon Woo Ku in six meetings, narrowing the head-to-head to 5–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-06 | W35 Nakhon Pathom 3 | SF | hard | Yeon Woo Ku | 6-2 6-4 |
| 2025-07-19 | W35 Monastir 2 | SF | hard | Yeon Woo Ku | 6-3 6-1 |
| 2025-06-22 | W35 Taipei 1 | F | hard | Yeon Woo Ku | 6-1 6-4 |
| 2025-05-14 | W35 Changwon 1 | R32 | hard | Yeon Woo Ku | 6-1 6-0 |
| 2025-04-04 | W15 Kashiwa 1 | R16 | hard | Yeon Woo Ku | 6-1 6-1 |
Averages over each player's completed matches in the selected window (200 vs 200). 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