
Marta Kostyuk defeated Katherine Sebov in the Round of 64 at the Toronto hard-court tournament. The match ended with a score of 7-6, 6-0 in favor of Kostyuk. Kostyuk hit 5 aces and converted 86% of her break points, securing 6 service breaks to Sebov's 3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-08-23 | Chicago 1 | R32 | hard | Marta Kostyuk | 6-0 6-3 |
Averages over each player's completed matches in the selected window (32 vs 33). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Strong favourite · Kostyuk M. heavily favoured
Calibrated model · 65% favourite accuracy (2025–26, out-of-sample). Probability is a statistical estimate, not a certainty. How it works.
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.
Kostyuk M.: 1 day rest · 2 matches, 55 games (7d) · Sebov K.: 15 days rest. Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Per-surface Serve / Return Rating (0–100, percentile within the hard field, opponent-adjusted over 52 weeks). About