Koepka betting favorite to win The Open after Round 1
David Cannon / David Cannon Collection / Getty

Brooks Koepka is now the odds-on favorite to win The Open after a sparkling 3-under 68 on Thursday at Royal Portrush in Northern Ireland. Here's a look at the top golfers based on Westgate Superbook's current betting odds:

Golfer Opening odds Current odds To par
Brooks Koepka 6-1 7-2 -3
Jon Rahm 20-1 6-1 -3
Tommy Fleetwood 25-1 10-1 -3
Justin Rose 14-1 14-1 -2
Shane Lowry 60-1 16-1 -4
Patrick Cantlay 25-1 25-1 -1
Tony Finau 50-1 25-1 -3
Webb Simpson 100-1 25-1 -3
Jordan Spieth 20-1 30-1 -1
Sergio Garcia 40-1 30-1 -3
Henrik Stenson 40-1 30-1 -1
Tyrrell Hatton 80-1 30-1 -3
J.B. Holmes 250-1 30-1 -5

Hometown hero Rory McIlroy and Tiger Woods began the tournament as two of the favorites at 10-1 and 12-1, respectively. But the two former World No. 1s have seen their odds plummet after playing themselves out of contention, with McIlroy sitting at 250-1 and Woods at 500-1.

Xander Schauffele (200-1), Adam Scott (500-1), and 2018 winner Francesco Molinari (250-1) also saw their odds fall drastically after stumbling out of the gate.

The betting community isn't exactly expecting a wire-to-wire finish for J.B. Holmes, who holds a one-shot lead after the first round.

If Koepka comes out on top, it would mark his fifth major in the last three years and his first time hoisting the Claret Jug.

Koepka betting favorite to win The Open after Round 1
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