All but one of the top 20 players in the world are competing in the tournament, one of the biggest in the circuit. Let's see the odds from bet365 (no US):
Rafael Nadal +188
Roger Federer +350
Novak Djokovic +350
Andy Murray +650
Robin Soderling +2000
Andy Roddick +2200
Tomas Berdych +2500
Gael Monfils +2500
Nikolay Davydenko +2500
Mikhail Youzhny +2800
Jo-Wilfried Tsonga +2800
David Ferrer +2800
Marin Cilic +5000
Stanislas Wawrinka +5000
John Isner +8000
Sam Querrey +8000
Richard Gasquet +8000
Jeremy Chardy +10000
Jurgen Melzer +10000
Ernests Gulbis +10000
Ivan Ljubicic +10000
Thiemo De Bakker +12500
Alexandr Dolgopolov +15000
Guillermo Garcia Lopez +15000
Janko Tipsarevic +15000
Benjamin Becker +20000
Michael Berrer +25000
Juan Monaco +25000
Mischa Zverev +25000
Daniel Gimeno-Traver +25000
Florian Mayer +30000
Kevin Anderson +30000
Thomaz Bellucci +40000
Andreas Seppi +40000
Lu Yen-hsun +40000
Marsel Ilhan +50000
Yan Bai +50000
Di Wu +20000
I guess one of the top three trio will win it, Nadal, Djokovic or Federer but I wouldn't be surprised to see Murray in the final.