Ji Sung Nam defeated Karunuday Singh 6-4 6-3 in the Vietnam F2 round of 32 on hard. The upset overturned the form book — Karunuday Singh came in leading the head-to-head 1–0, but Ji Sung Nam had been the form player, winning 8 of their last 9 on hard. Ji Sung Nam claimed a first win over Karunuday Singh in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-03 | Indonesia F5 | R32 | hard | Karunuday Singh | 3-6 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.