Rafael Nadal's dominance on clay significantly influences betting odds due to his unparalleled track record and expertise on the surface. His consistent success at prestigious tournaments like the French Open, where he holds a record number of titles, tends to create a perception among bettors that he is the overwhelming favorite whenever he competes on clay. This can lead to shorter odds against Nadal, reflecting the perceived low risk of him losing. Conversely, this dominance can also skew the odds for his opponents, who may be considered underdogs, resulting in potentially more favorable payouts for bets placed against Nadal.