When evaluating the importance of head-to-head data in tennis betting decisions across different surfaces, it is crucial to consider both the surface type and the playing styles of the competitors. Head-to-head records can provide insights into how players have performed against each other in the past, but these results can vary significantly depending on the surface, as certain players may excel on grass while others dominate on clay or hard courts. Additionally, factors such as current form, injuries, and playing conditions must also be weighed alongside historical data. Therefore, while head-to-head records serve as a valuable tool for context, they should be integrated with a holistic analysis of current performance metrics, surface dynamics, and individual player matchups to make informed betting decisions.