Kumiko Iijima defeated Tomoko Yonemura 6-1 6-3 in the Nanjing 25K round of 16 on hard. The upset overturned the form book — Tomoko Yonemura came in leading the head-to-head 8–2, but Kumiko Iijima had been the form player, winning 2 of their last 4 on hard. Kumiko Iijima narrowed the head-to-head to 8–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-05-26 | Gunma 25K | F | carpet | Tomoko Yonemura | 6-0 6-3 |
| 2008-05-05 | Fukuoka 50K | QF | grass | Tomoko Yonemura | 6-4 6-3 |
| 2007-06-25 | Noto 25K | R32 | carpet | Tomoko Yonemura | 1-0 |
| 2006-07-10 | Miyazaki 25K | R16 | carpet | Tomoko Yonemura | 6-4 6-3 |
| 2006-06-19 | Changwon 25K | R16 | hard | Tomoko Yonemura | 6-2 6-7(1) 7-5 |
| 2006-05-22 | Nagano 25K | SF | carpet | Tomoko Yonemura | 5-7 7-6(3) 6-2 |
| 2006-05-08 | Fukuoka 50K | R32 | grass | Kumiko Iijima | 6-2 6-3 |
| 2004-07-12 | Gunma 25K | R32 | carpet | Kumiko Iijima | 2-6 6-2 6-1 |
| 2003-10-13 | Haibara 25K | R32 | carpet | Tomoko Yonemura | 6-3 4-6 6-3 |
| 2003-09-22 | Hiroshima 10K | SF | grass | Tomoko Yonemura | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.