Thassha Vitayaviroj defeated Sandy Gumulya 6-4 7-5 in the Balikpapan 10K semi-final on hard. The upset overturned the form book — Sandy Gumulya came in leading the head-to-head 1–0. Thassha Vitayaviroj claimed a first win over Sandy Gumulya in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-03-20 | New Delhi 2 10K | QF | hard | Sandy Gumulya | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.