Mari Inoue defeated Tomoko Sugano 6-2 7-6 in the Hyogo 10K round of 16 on carpet. The upset overturned the form book — Tomoko Sugano came in leading the head-to-head 5–0. Mari Inoue claimed a first win over Tomoko Sugano in six meetings, narrowing the head-to-head to 5–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-09-03 | Kyoto 10K | R32 | carpet | Tomoko Sugano | 6-4 6-0 |
| 2007-07-30 | Obihiro 25K | R32 | carpet | Tomoko Sugano | 6-1 6-7(3) 6-3 |
| 2005-10-24 | Tokyo 2 10K | R32 | hard | Tomoko Sugano | 4-6 6-3 6-2 |
| 2005-09-05 | Kyoto 10K | R16 | carpet | Tomoko Sugano | 1-6 6-4 6-2 |
| 2003-09-22 | Hiroshima 10K | R32 | grass | Tomoko Sugano | 6-4 6-4 |