NO ONE WATCHES A CLOCK when Kemba Walker runs. UConn's junior guard is the fastest player in college basketball, period, and quantifying his speed would do nothing to clarify that. Watch him make a steal and go coast-to-coast. Did it happen in a blink of an eye? A fraction of a heartbeat? "He's got that kind of speed there really is no defense for," says an NBA scout. "It changes the game at any level, for the same reason: Gone is gone."