Greg Merson won the 2012 event and is listed at 100/1 to repeat as champion. The last player to win back-to-back Main Events was Johnny Chan in 1987 and 1988.
The Main Event gets underway on July 6 at the Rio All-Suite Hotel & Casino in Paradise, Nevada.
Here are the top 20 players' odds courtesy of bwin.com:
Daniel Negreanu (CAN) 40/1
Phil Ivey (USA) 50/1
Phil Hellmuth (USA) 50/1
Johnny Chan (CHN) 50/1
Allen Cunningham (USA) 66/1
Jeremy Ausmus (USA) 66/1
Bryan Piccoli (USA) 66/1
Chris Ferguson (USA) 66/1
Jonathan Duhamel (CAN) 66/1
Tom Dwan (USA) 80/1
Erik Seidel (USA) 80/1
Doyle Brunson (USA) 80/1
Aaron Lim (AUS) 100/1
Jesse Sylvia (USA) 100/1
Vitaly Lunkin (RUS) 100/1
Michael Mizrachi (USA) 100/1
Jason Mercier (USA) 100/1
Patrik Antonius (FIN) 100/1
Pius Heinz (GER) 100/1
Russell Thomas (USA) 100/1
