Nikki Redelijk defeated Katherine Hui 6-1 2-6 7-6 in the W15 San Diego 1 quarter-final on hard. The upset overturned the form book — Katherine Hui came in leading the head-to-head 1–0, but Nikki Redelijk had been the form player, winning 7 of their last 10 on hard. Nikki Redelijk claimed a first win over Katherine Hui in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-06-28 | W15 Irvine 1 | R32 | hard | Katherine Hui | 7-5 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.