Aisam Ul Haq Qureshi defeated Yong Il Yoon 6-0 6-1 in the Australian Open q128 on hard. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 1–0. Aisam Ul Haq Qureshi claimed a first win over Yong Il Yoon in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-10-07 | Japan F4 | QF | carpet | Yong Il Yoon | 6-4 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.