

Diana Shnaider defeated Marta Kostyuk 7-6 6-3 in the Seoul quarter-final on hard. The upset overturned the form book — Marta Kostyuk came in ranked #15.
The Umpiry Score combines match-context factors — matchup, form, fatigue, travel and motivation — into a single 0–10 score, updated daily. Read how it works.
No previous meetings on record.
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.