Let's be honest, we're not all tennis experts here. With the US Open in full swing and all the talk about it, here's what you need to know about who's who, who to keep an eye on, and who is just good old fashioned eye candy. The fan-favorite Rafael Nadal may be the men's defending champion, but he will be sitting out this year with a wrist injury. Serena Williams, the women's defending champion, on the other hand will face some intense rookie competitors. Read on to get the full scoop!
[Photo via @gulenkorkut]