Yuuki Tanaka defeated Mari Tanaka 4-6 6-3 7-5 in the Niigata 10K qualifying round on carpet. The upset overturned the form book — Mari Tanaka came in leading the head-to-head 4–1. Yuuki Tanaka narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-09-09 | Incheon 25K | R32 | hard | Yuuki Tanaka | 6-1 6-3 |
| 2013-09-02 | Noto 25K | R16 | grass | Mari Tanaka | 6-3 6-0 |
| 2013-08-26 | Tsukuba 25K | R32 | hard | Mari Tanaka | 6-0 1-6 6-4 |
| 2013-05-20 | Karuizawa 25K | R32 | grass | Mari Tanaka | 7-5 6-3 |
| 2012-08-13 | Istanbul 10K | F | hard | Mari Tanaka | 6-0 6-2 |
Averages over each player's completed matches in the selected window (49 vs 3). 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