Odds makers’ are banking on the 2016 U.S. Open to mirror the PGA’s world rankings. Australia’s Jason Day, Northern Ireland’s Rory McIlroy, and American and defending champion Jordan Spieth are the top three favorites to win the major beginning Thursday at Oakmont Country Club in Pennsylvania.

No. 1 ranked and money leader Day, who’s runner-upped twice in the tournament and would be just the third Australian to win, leads the top tier of contenders with 13/2 odds while No. 3 McIlroy is a tick back at 15/2 and No. 2 Spieth sits at 9/1, according to Sportsbook.ag.

Given all three players success this season and in years past, one can’t fault odds makers though. Spieth stood at 8/1 odds prior to taking last year’s tournament with a 5-under 275 following his dominant and star-making performance at the Masters.

However, the early prognostications and a bit of doubt in the 22-year-old’s chances of repeating aren’t unwarranted. Only five players in the U.S. Open history have won consecutive titles, with American Curtis Strange the last to do so in 1988 and 1989.

Spieth, also, isn’t nearly has hot compared to last year. He’s won two tournaments and achieved five top 10 finishes, but Day appears to be in the zone at the moment.

Hoping to build on his second-place finishes in 2013 and 2011, Day’s leading both the FedEx Cup standings by nearly 200 points and the money leaderboard by almost $1 million over compatriot Adam Scott, and he’s tied for fourth with six top 10 finishes in 11 events this year. Day also tops the tour in total average strokes per round and putting, which is reason enough to believe he can overcome a disappointing 27 th place finish at the Memorial Tournament last week.

McIlroy, who won in 2011 for his first major title and shot an incredible 16-under, has yet to win a single tournament this season and his best showing was a tie for third at the WGC-Cadillac in March.

The favored triumvirate, however, will have to deal with a loaded field of contenders including American Phil Mickelson.

Though he’s never won the U.S. Open and wound up in second six times, most recently three years ago, Mickelson will make his 26th career start in the tournament, by far the most of any other player. At 25/1 odds, Mickelson currently trails Dustin Johnson at 12/1.

Odds To Win 2016 U.S. Open

Jason Day 13/2

Rory McIlroy 15/2

Jordan Spieth 9/1

Dustin Johnson 12/1

Phil Mickelson 25/1

Justin Rose 28/1

Henrik Stenson 30/1

Adam Scott 33/1

Hideki Matsuyama 33/1

Rickie Fowler 33/1

Matt Kuchar 35/1

Brooks Koepka 40/1

Bubba Watson 40/1

Danny Willett 40/1

Patrick Reed 40/1

Sergio Garcia 40/1

Branden Grace 50/1

Brandt Snedeker 60/1

Here’s the full list of odds via Sportsbook.ag