The optimal risk-reward ratio for tennis betting generally ranges from 1:2 to 1:3, meaning for every unit of risk, bettors aim to win two to three units. This ratio ensures that even if the bettor wins only 40-50% of their bets, they can still be profitable in the long run. Tennis matches can be unpredictable, and factors like player form, head-to-head records, and surface conditions can significantly impact outcomes, making it crucial for bettors to find value in odds that offer favorable risk-reward ratios while maintaining disciplined bankroll management.