Assessing the risk of betting on a player in a long-duration match involves analyzing multiple factors, including the player's current form, historical performance in similar conditions, and physical endurance. Evaluating the player's fitness level and any past injuries is crucial, as these can significantly impact performance over extended play. Additionally, consider the matchup against their opponent, conditions (e.g., weather, surface), and any psychological factors that might affect their focus and stamina. Finally, reviewing betting odds and market sentiment can offer insights into public perception and potential value. Combining these elements can help gauge the risk and make informed betting decisions.