Tennis: Players must withstand test of time at U.S. Open

U.S. -

U.S.—afael Nadal's elaborate pre-serve routine will be put to the ultimate test at next week's U.S. Open when a countdown clock makes its Grand Slam debut to help speed up play.

Tennis: Players must withstand test of time at U.S. Open. Rafael Nadal's elaborate pre-serve routine will be put to the ultimate test at next week's U.S. Open when a countdown clock makes its Grand Slam debut to help speed up play.