Tasuku Iwami defeated Weerapat Doakmaiklee 6-1 3-6 6-2 in the Japan F4 round of 32 on hard. The upset overturned the form book — Weerapat Doakmaiklee came in leading the head-to-head 2–0. Tasuku Iwami claimed a first win over Weerapat Doakmaiklee in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-03-22 | Japan F2 | R32 | hard | Weerapat Doakmaiklee | 6-1 3-6 6-2 |
| 2009-08-24 | Thailand F2 | R16 | hard | Weerapat Doakmaiklee | 2-6 7-6(4) 7-6(6) |