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McIlroy, Rahm betting co-favorites after Open Round 1

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They're both three shots off the lead, but after starting The Open with rounds in the 60s Rory McIlroy and Jon Rahm are now betting co-favorites to lift the claret jug at Carnoustie.

McIlroy is four years removed from his Open triumph at Royal Liverpool, while Rahm remains in search of his first major title. Both carded rounds of 2-under 69 in Scotland to sit three shots off the lead of Kevin Kisner. While McIlroy started the tournament at 16/1 and Rahm at 20/1, they're now dead even at 10/1 in updated odds at the Westgate Las Vegas Superbook.

Kisner started the week at 200/1, but after an opening-round 66 he's quickly been trimmed to 25/1. Tony Finau sits one shot behind Kisner and is now listed behind only McIlroy and Rahm at 12/1 after starting the tournament at 60/1.

On the other side of the coin, consensus pre-tournament betting favorite Dustin Johnson fell from 12/1 to 100/1 following an opening 76 while Masters champ Patrick Reed shot a 4-over 75 to plummet from 30/1 to 200/1. Trailing by five shots following an opening-round 71, Tiger Woods' odds remained unchanged at 25/1 as he seeks a 15th career major title.

Here's a look at the revised betting odds heading into the second round at Carnoustie:

10/1: Rory McIlroy, Jon Rahm

12/1: Tony Finau

14/1: Justin Thomas, Rickie Fowler

20/1: Francesco Molinari

25/1: Tiger Woods, Alex Noren, Henrik Stenson, Kevin Kisner

30/1: Jordan Spieth, Zach Johnson, Tommy Fleetwood, Justin Rose, Brooks Koepka

40/1: Ryan Moore, Jason Day

50/1: Erik Van Rooyen, Brandon Stone, Matt Kuchar

60/1: Danny Willett, Thomas Pieters, Marc Leishman, Thorbjorn Olesen, Russell Henley, Matthew Southgate

80/1: Webb Simpson, Adam Scott, Patrick Cantlay, Brendan Steele, Kevin Na

100/1: Dustin Johnson, Zander Lombard, Sung Kang, Paul Casey, Louis Oosthuizen, Xander Schauffele, Chris Wood, Pat Perez, Luke List, Charley Hoffman