Shuko Aoyama defeated Riko Sawayanagi 2-6 6-3 6-0 in the Hamamatsu 25K qualifying round on grass. The upset overturned the form book — Riko Sawayanagi came in leading the head-to-head 3–0. Shuko Aoyama claimed a first win over Riko Sawayanagi in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-10-12 | Makinohara $25K | SF | grass | Riko Sawayanagi | 6-0 6-2 |
| 2014-10-20 | Hamamatsu 25K | SF | carpet | Riko Sawayanagi | 6-4 6-2 |
| 2011-05-16 | Karuizawa 25K | R32 | carpet | Riko Sawayanagi | 2-6 6-3 6-4 |
Averages over each player's completed matches in the selected window (73 vs 86). 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