After last year's classic final between Rafael Nadal and Roger Federer, are we in store for more drama in 2009? Zack Pierce has five big questions for the men's field at Wimbledon.More on Wimbledon: Five big questions for the women | Wimbledon Central
Who will challenge the Big Four?
We haven't had a Wimbledon men's semifinal round feature all of the top four seeds since Andre Agassi, Pete Sampras, Boris Becker and Goran Ivanisevic turned the trick in 1995. That means we're likely to have someone spring an upset and crash the party. Who will it be? The smart money's on fifth-ranked Juan Martin del Potro (pictured), who is getting better all the time at the Slams and gave Roger Federer all he could handle in the French Open semis.More on Wimbledon: Five big questions for the women | Wimbledon Central
Which direction is Djokovic heading?
After reaching the final at the 2007 U.S. Open and then winning the 2008 Australian Open, Novak Djokovic looked like the next No. 1 in men's tennis. But Djokovic has taken steps backward at each of the four Slams, most recently losing in the third round at the French after having made the semis in 2008. Does Djokovic still have a run at No. 1 in him, or is this the start of a decline?More on Wimbledon: Five big questions for the women | Wimbledon Central
Who can stay healthy?
Rafael Nadal has pulled out. Andy Roddick (pictured) hurt himself in his last match. With a pair of Wimbledon stars injured (and they're not the only ones hurting), the field could be wide open. One or the other of those two has appeared in the last five finals at the All England Club, but if their health is compromised, that's good news for the likes of Andy Murray, Novak Djokovic and the rest of the top players seeking a Wimbledon breakthrough.More on Wimbledon: Five big questions for the women | Wimbledon Central
Is it Andy Murray's time?
It's been a long time since a British man won Wimbledon -- 72 years and counting. Fred Perry accomplished the feat in 1936, but the UK has had only one finalist since then and no winners. The pressure is on Andy Murray -- who just won the grass-court tuneup at Queen's Club on Sunday -- to deliver the goods.More on Wimbledon: Five big questions for the women | Wimbledon Central
Will Roger get his crown back?
By now, you know the story. Five times in a row the Wimbledon champ. Title stripped away by Rafa Nadal in a five-set thriller last year. Now, he's taken Nadal's French Open title away and is hungry for a record-breaking 15th Grand Slam win at his favorite venue. He'll be the odds-on favorite, but he'll have plenty of apt challengers to push aside.More on Wimbledon: Five big questions for the women | Wimbledon Central