Sofia Costoulas vs Guo Hanyu prediction for May 20, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects Guo Hanyu 0 - Sofia Costoulas 0. Sofia Costoulas is favored with a 60.0% win probability.
Guo Hanyu
1474
Clay Elo
VS
Clay • WTA
Sofia Costoulas
1540
Clay Elo
Match Win Probability
Guo HanyuSofia Costoulas
Clay
Surface
WTA French Open
Tournament
10,000
Simulations
Calibrated accuracy at this confidence: 54.5% (3,626 games)
Match Context
Tournament
WTA French Open
Surface
Clay
Format
Best of 3 · WTA
Surface Elo Ratings (Clay)
Sofia Costoulas
Guo Hanyu
Sofia Costoulas leads by 66 Elo points on Clay
Serve & Return Analysis
Serve Points Won % (SPW) is the single most predictive metric in tennis. WTA average on Clay: 56.5%
Sofia Costoulas SPW
56.7%
Above tour avg
Guo Hanyu SPW
54.5%
Below tour avg
● Sofia Costoulas has a slight serve edge (+2.2%)
Key Matchup Factors
- Sofia Costoulas has a moderate 66-point Elo edge on Clay
- Clay surface reduces serve dominance — expect more breaks of serve and longer rallies
- Sofia Costoulas has the stronger serve profile on this surface
Surface Elo v1.0 · Barnett-Clarke serve model · 10,000 simulations · WTA
Edge Analysis
Moneyline
Sofia Costoulas 60.0%
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How this prediction was generated: This page shows output from the Olympus Bets ATP/WTA Tennis Monte Carlo engine. Each game is simulated 10,000 times using real-time team data, injury reports, and current odds. Probabilities are calibrated using Bayesian methods and sized via the Kelly Criterion. Full methodology →