We know — you've been too busy watching the players: Andy Roddick in his Babolats, Roger Federer in his Nikes. But at the US Open, even the ball boys rock heat. This year they're in the Polo Ralph Lauren by New Balance 851, a performance tennis sneaker that features the Polo pony on the side, NB branding on the tongue and heel, and all the cushioning and abrasion protection you'd expect from a top-of-the-line tennis shoe. Available now for $99.50 from Ralph Lauren dot com and select Ralph Lauren retailers. No ball-chasing required.