Jordan Spieth has been installed as the favorite to win the 2018 Masters, according to the Westgate Las Vegas SuperBook. On Monday, Spieth opened as the favorite at 7-1 to win next year at Augusta National. Dustin Johnson is next at 8-1, followed by Rory McIlroy at 10-1. Jason Day, Rickie Fowler and Hideki Matsuyama are each 15-1, while a pair of 2017 major champions, Justin Thomas and Brooks Koepka, opened at 25-1. Read more http://www.espn.com/chalk/story/_/i...pens-2018-masters-favorite-westgate-superbook