Novak Djokovic's serve velocity tends to be higher on hard courts compared to clay courts. This difference is primarily due to the surface characteristics; hard courts generally provide a faster and more consistent bounce, allowing players to generate more power and spin with their serves. On clay, the slower surface absorbs more speed and can result in lower serve velocities, as players often prioritize placement and spin over sheer power to adapt to the conditions. Consequently, Djokovic’s serve can be more aggressive and impactful on hard courts, contributing to his overall effectiveness and success on those surfaces.