Brooks Koepka fell short in his attempt to win his third consecutive U.S. Open on Sunday, but the four-time major champion has already been installed as the early favorite to win next month's Open Championship in Northern Ireland.

PointsBet listed Koepka at 9/1 and FanDuel at 7/1, slightly ahead of Rory McIlroy (10/1 and 8.5/1), who will be an overwhelming crowd favorite as he seeks to win The Open in his home country. Dustin Johnson, Jordan Spieth and Tiger Woods were all listed at 12/1 by PointsBet on Monday, while FanDuel had Woods at 9.5/1 and the other two at 12/1.

Gary Woodland held off Koepka at Pebble Beach to claim his first major championship and rise to No. 12 in the world rankings, but he is still only 66/1 by PointsBet.

The 148th Open Championship will be held at Royal Portrush July 18-21.

Portrush native Graeme McDowell secured his entry into the event at the RBC Canadian Open earlier this month. Despite posting a solid T16 finish at the U.S. Open, McDowell is still 42/1 by FanDuel while PointsBet isn't yet offering a future wager on the 39-year-old.

However, PointsBet is offering 5,000/1 odds on 1995 Open champion John Daly.