New York: Samantha Stosur joined fellow former US Open champion Maria Sharapova in calling for a clamp down on tennis time-wasters on Tuesday. Australian 30-year-old Stosur demanded that the '20-seconds between points' rule be strictly observed regardless of the status of players within the sport who may be tempted to abuse it to gain an edge.

Stosur's demands came just a day after Sharapova only half-jokingly said that all players insisting on medical timeouts should be charged $2,500 as a test of the severity of their ailments. "Maybe this 20 second rule needs to be implemented fairly for all players on all courts.