Guinness World Record attempt with Mardy Fish

Anyone with a knack for paddling balls can help make history: Mardy Fish, the top-seeded American men’s singles player, will lead an attempt to set a new Guinness World Record for the most people bouncing tennis balls on rackets in one location. Be sure to bring your own gear—only kids will get freebies, provided by Wilson. (But the first 800 people to show up get a free T-shirt. Ace!)