August 29th marks the kickoff to the 2011 US Open, one of the four Grand Slam tournaments. Last year, Rafael Nadal won his first US Open title and Kim Clijsters became the first woman to repeat as Women’s Singles champ since Venus Williams in ’01. She won’t be threepeating as she withdrew from play with stomach muscle injury. Those games of “tummy sticks” can get pretty intense. Anyway, if you’re not a diehard tennis fan, you might opt not to watch. Big mistake. You’ll be missing out on some of the hottest athletes in the world. Luckily, we’ve pinpointed the definitive list of ball-bashing babes to keep an eye on in this year’s affair. Check it out then let us know if we missed anyone in the comments section after the jump.

With the US Open gearing up to start August 30th, we’re gearing up for a whole lot’a beautiful girls playing tennis. Last year, the big topic was whether or not officials will begin penalizing female tennis players for grunting like wild beasts on the court. This year a new study says that grunting actually improves a player’s power, thus improving a player’s game. Regardless, we revel in the sounds that exude from these sexy women of sport. But it got us to thinking, could we tell the difference between a tennis grunt and a porn grunt? To answer this question, we put together this little game to test your grunt guessing abilities.

With the French Open just a couple weeks past and Wimbledon coming up on June 22nd, there’s a whole lot’a tennis going on these days. And with that comes a lot of tennis talk. This year, the big topic is whether or not officials will begin penalizing female tennis players for grunting like wild beasts on the court at Wimbledon. Which got us thinking, could you tell the difference between a tennis grunt and porn grunt?