US Open Tennis 2011 Scores: Day-by-Day Results and Recaps

Tennis is at a crossroads, and the US Open will be indicative of where mainstays in the sport are headed. Huge questions linger above the quartet of players who currently rule tennis, leaving this year's edition of the US Open completely wide open.

Novak Djokovic has shoulder issues that could keep him from finishing out his year of dominance that rendered him the No. 1 overall world ranking.

Roger Federer is on the decline, but he seems to have the blueprint for beating Djokovic. He could easily be considered the favorite should the two square off. It all comes back to how Djokovic's shoulder holds up.

Given that the two wouldn't square off until the semifinals, the status of his shoulder could take a sharp downturn by that point.

Rafael Nadal surrendered the No. 1 ranking at Wimbledon and is fighting to remain at the top of the tennis world. He may have been dethroned, but he's still a world-class tennis player. His experience in high-pressure situations could be a difference-maker here.

Andy Murray can't be seen as an elite player until he comes away with a Grand Slam victory. This could be the time when he turns a deep run into a big win.

Mardy Fish is fighting to keep America in the tennis mix and players like Jo-Wilfried Tsonga strive to make their presence felt at the tournament.

On the women's side, the big story thus far is the absurd 28th seed that was bestowed upon Serena Williams. Both she and Venus are in a position to become bracket busters, as both will use this tournament as an opportunity to really excel for the first time since their respective layoffs.

We'll have you covered each and every day of the US Open with updates right here on this live blog.