• French Open (claycourt) 51%
• Australian Open (hardcourt) 46%
• US Open (hardcourt) 35%
• Wimbledon (grass) 19%
Another interesting difference between surfaces is that on hardcourts professional players are under increased time-pressure 45% of time, compared with only 29% on clay-courts (Pieper et al 2007). Therefore, court surfaces do play a role in the movement requirements of tennis athletes and training needs to be adapted based on these differences.
These studies just highlight the need for different focused training based on the type of surface that the athlete will be training and competes. It is important to take into consideration the surface and the workloads that are involved in the different surfaces when focusing on tennis-specific movement training.
Weber, K., S. Pieper, et al. (2007). "Characteristics and significance of running speed at the Australian Open 2006 for training and injury prevention." Medicine and Science in Tennis 12(1): 14-17.