David Goffin vs Toby Samuel prediction for May 20, 2026: Our Monte Carlo simulation ran 10,000 game iterations and projects Toby Samuel 0 - David Goffin 0. David Goffin is favored with a 55.0% win probability.
Toby Samuel
1508
Clay Elo
VS
Clay • ATP
David Goffin
1438
Clay Elo
Match Win Probability
Toby SamuelDavid Goffin
Clay
Surface
ATP French Open
Tournament
10,000
Simulations
Calibrated accuracy at this confidence: 56.4% (2,644 games)
Match Context
Tournament
ATP French Open
Surface
Clay
Format
Best of 5 · ATP
Surface Elo Ratings (Clay)
David Goffin
Toby Samuel
Toby Samuel leads by 69 Elo points on Clay
Serve & Return Analysis
Serve Points Won % (SPW) is the single most predictive metric in tennis. ATP average on Clay: 63.5%
David Goffin SPW
62.8%
Below tour avg
Toby Samuel SPW
59.9%
Below tour avg
● David Goffin has a slight serve edge (+3.0%)
Market Odds & Model Edge
David Goffin ML
+117
Model: 55%
Edge: +9.0%
Toby Samuel ML
-140
Model: 45%
Edge: -13.4%
Model Projection
David Goffin ML +117 · +9.0% edge
Key Matchup Factors
- Toby Samuel has a moderate 69-point Elo edge on Clay
- Clay surface reduces serve dominance — expect more breaks of serve and longer rallies
- David Goffin has the stronger serve profile on this surface
Surface Elo v1.0 · Barnett-Clarke serve model · 10,000 simulations · ATP
Edge Analysis
Moneyline
David Goffin 55.0%
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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 →