Yukina Saigo defeated Kumi So 7-6 6-2 in the Tokyo 10K q32 on hard. The upset overturned the form book — Kumi So came in leading the head-to-head 1–0, but Yukina Saigo had been the form player, winning 2 of their last 4 on hard. Yukina Saigo claimed a first win over Kumi So in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-10-19 | Hamamatsu $25K | Q32 | grass | Kumi So | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.