Kumiko Iijima defeated Ling Zhang 7-5 6-3 in the Tsukuba 25K round of 16 on hard. The result followed the form book — Kumiko Iijima came in leading the head-to-head 2–1. Kumiko Iijima extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-04-05 | Incheon 25K | R16 | hard | Ling Zhang | 6-4 6-3 |
| 2007-09-17 | Tsukuba 25K | SF | hard | Kumiko Iijima | 6-1 6-3 |
| 2007-07-30 | Obihiro 25K | R32 | carpet | Kumiko Iijima | 6-4 3-6 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.