\" \" Pickleball players use a paddle that's smaller than a tennis racquet but larger than a ping-pong paddle and bat a whiffle-type ball back and forth. That's not surprising, as it was the 55-plus set that began growing the paddle sport with the quirky name around the late 2000s. If the receiving team returns the serve, the serving team must also let the ball bounce once before hitting it. In 2018, the U.S. Open Pickleball Championships drew more than 2,100 competitors, according to Selkirk Sports, which manufactures pickleball paddles. Pickleball may even become an Olympic sport one day, especially if the International Federation of Pickleball (IFP) gets its way.