Does American tennis have a pickleball problem? “Quite frankly, it’s obnoxious to hear that pickleball noise,” U.S. Tennis Association President Dr. Brian Hainline grumbled at a recent state-of-the-game news conference, bemoaning the distinctive pock, pock, pock of pickleball points. Pickleball, an easy-to-play mix of tennis and ping pong using paddles and a wiffleball, has quickly soared from nearly nothing to 13.6 million U.S. players in just a few years, leading tennis purists to fear a day when it could surpass tennis’ 23.8 million players.