Haruka Kaji defeated Sara Saito 5-7 6-2 6-3 in the W50 Kofu 1 semi-final on hard. The upset overturned the form book — Sara Saito came in ranked #241, leading the head-to-head 2–1. Haruka Kaji narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-01-11 | W50 Nonthaburi 2 | R16 | hard | Sara Saito | 7-5 3-6 5-0 |
| 2023-05-10 | W60 Fukuoka | R32 | carpet | Sara Saito | 7-5 7-6(0) |
| 2023-04-11 | W25 Osaka | R32 | hard | Haruka Kaji | 6-0 6-3 |
Averages over each player's completed matches in the selected window (83 vs 77). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About