Ye Ra Lee defeated Natsumi Hamamura 6-3 6-1 in the Hamilton 10K qualifying round on hard. The upset overturned the form book — Natsumi Hamamura came in leading the head-to-head 2–0. Ye Ra Lee claimed a first win over Natsumi Hamamura in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-07-27 | Obihiro-Tokachi 25K | R32 | carpet | Natsumi Hamamura | 6-3 6-2 |
| 2007-05-14 | Changwon 25K | R16 | hard | Natsumi Hamamura | 7-6(4) 1-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.