After only one round at the 2018 Masters, Jordan Spieth is now a prohibitive betting favorite to slip into a second green jacket.
The Westgate Las Vegas SuperBook listed Spieth as a 7/1 favorite when Masters betting opened in August, and he teed off Thursday as a 10/1 co-favorite with Justin Thomas. But after taking an early lead with a 6-under 66, Spieth's odds to win have been trimmed to just 2/1.
In closest pursuit on the betting board is Rory McIlroy, who is tied for fourth after a 3-under 69. McIlroy began the tournament at 12/1 but is now just 5/1 odds to complete the final leg of the career Grand Slam.
Here's a look at the odds for the contenders still left standing after the opening round at Augusta National, along with a few of the favorites whose chances to win have all but vanished:
2/1: Jordan Spieth
5/1: Rory McIlroy
14/1: Phil Mickelson, Matt Kuchar
16/1: Henrik Stenson, Rickie Fowler
20/1: Patrick Reed
25/1: Justin Rose
30/1: Dustin Johnson, Tiger Woods, Tony Finau, Marc Leishman
40/1: Rafael Cabrera-Bello, Justin Thomas, Charley Hoffman
50/1: Bubba Watson, Louis Oosthuizen, Tommy Fleetwood
60/1: Adam Hadwin, Hideki Matsuyama, Zach Johnson
80/1: Haotong Li, Xander Schauffele
100/1: Paul Casey
125/1: Jason Day
150/1: Jon Rahm
250/1: Adam Scott
2000/1: Sergio Garcia