Masato Hatanaka defeated Yuichi Ito 6-4 6-2 in the Japan F8 round of 32 on hard. The upset overturned the form book — Yuichi Ito came in leading the head-to-head 5–3. Masato Hatanaka narrowed the head-to-head to 5–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-21 | Japan F7 | R16 | carpet | Yuichi Ito | 5-7 6-4 6-2 |
| 2010-06-07 | Japan F5 | R32 | clay | Yuichi Ito | 6-2 6-2 |
| 2010-04-26 | Korea F4 | R32 | hard | Masato Hatanaka | 7-6(3) 6-3 |
| 2009-07-20 | Korean Rep F6 | R32 | hard | Masato Hatanaka | 2-6 6-2 6-4 |
| 2009-04-20 | India F3 | R32 | hard | Masato Hatanaka | 5-4 |
| 2008-09-08 | Japan F8 | R32 | hard | Yuichi Ito | 6-3 7-6(5) |
| 2005-05-30 | Japan F5 | R32 | hard | Yuichi Ito | 6-0 4-6 6-4 |
| 2005-04-11 | Japan F1 | R32 | carpet | Yuichi Ito | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.