The Northern Irishman's recent success has seen him replace Tiger Woods as the bookmakers' leading candidate to claim the green jacket in Augusta when play gets underway on April 5.
The Masters is the only major missing from McIlroy's CV, but with less than three weeks until the tournament gets underway Bet365 currently has the four-time major winner at 9/1 alongside American Dustin Johnson.
Although Woods has not won a PGA tournament since 2013, a timely return to form -- including a 5th-placed finish at Bay Hill -- sees the four-time Masters champion remain a popular choice at 10/1.
The Masters takes place April 5-8 at Augusta National Golf Club.
Bet365's current odds-on favourites to win the 2018 US Masters
Rory McIlroy - 9/1
Dustin Johnson - 9/1
Tiger Woods - 10/1
Justin Thomas - 11/1
Jordan Spieth - 12/1
Justin Rose - 14/1
Jason Day - 18/1
Jon Rahm - 18/1
Phil Mickelson - 20/1
Rickie Fowler - 20/1