Prediction market trends heavily favor Sinner with implied probabilities near 85% for his victory and 70% for under 20.5 games or 2 sets, while Fonseca win and over 20.5 games or 3 sets sit as the least played options below 20% probability.
Fonseca shows upset potential through his resilient comeback against Khachanov saving match points and bold straight-set win over Paul, halting Sinner's unbeaten run possible if exploiting any early service lapses as seen in Sinner's first game versus Shapovalov, implying 15-20% probability. Confidence level: 4/10.