Sofia Costoulas vs Tatiana Prozorova Prediction (Sep 21, 2026)
Result: Tatiana Prozorova won. We gave Tatiana Prozorova 55% before the match, so our pick (Tatiana Prozorova) was right.
Brier score (lower is better): ours 0.203, market six hours out 0.160.
| Our model | Tatiana Prozorova 55% · Sofia Costoulas 45% |
| Market price at our call | Tatiana Prozorova 56% |
| Event | Singapore · Hard |
| Scheduled start | Mon Sep 21, 2026, 02:00 AM ET |
| Call logged | 2026-09-20 03:09 UTC (before first serve) |
Every call we make is logged before the match and graded after it. See the live tennis board, the full match list and our public track record.
All Singapore 2026 predictions
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