Does Tennis Need a Shot Clock?: Novak Djovokic and Rafael Nadal played a 5-hour, 53-minute final at the Australian Open in January. Both players averaged more than 30 seconds between points, above the 20 seconds allowed in Grand Slam play, and still took too long after an umpire's warning. According to USA Today, the match "would have run roughly an hour shorter had they stayed within the rule." Andy Roddick and some other pros would like to see a shot clock. "I think that would be a good idea," said Robby Ginepri. "You have the radar gun there. Why not have it right above that?"