Yoriko Yamagishi defeated Arati Ponnappa 6-4 7-6 in the Bangkok 10K round of 16 on hard. The upset overturned the form book — Arati Ponnappa came in leading the head-to-head 2–0. Yoriko Yamagishi claimed a first win over Arati Ponnappa in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-02-23 | Mumbai 10K | R32 | hard | Arati Ponnappa | 6-3 6-2 |
| 1996-07-08 | Felixstowe 10K | R16 | clay | Arati Ponnappa | 6-3 7-5 |