It's time to get the game up to speed

Murray, Federer want to see shot clock introduced

Rafael Nadal tugging at his shorts and doing his usual pre-serve routine. Novak Djokovic bouncing the ball more than a dozen times. Maria Sharapova facing away from the court between serves. Countless players going to the towel, point after point.

These are some of the things that have people at Wimbledon talking about whether there needs to be stronger enforcement of rules that set time limits between points.