It has been eight years since Jordan Spieth has won a major tournament and three years since he has won an event of any type, but that hasn't deterred bettors who believe the 31-year-old is primed to complete the career grand slam this week.
Spieth is the biggest liability in the entire PGA Championship field at BetRivers, where he has been backed by 4.2 per cent of the total bets and 3.8 per cent of the money wagered on this week's winner at Quail Hollow. His odds opened at +4000 but have lengthened to +6000.
Rory McIlroy won his first major in 11 years at last month's Masters to complete his career grand slam. The "major" difference, however, is that McIlroy is ranked No. 2 in the world and had already won twice in 2025.
Spieth's most recent victory came at the 2022 RBC Heritage. He is currently ranked 48th in the world and is coming off a tie for 34th at last week's Truist Championship. Spieth does have three top-10 finishes this year, but none of them have come at a major or signature event.
BETTORS DRAWN TO HIS LONGSHOT ODDS
BetMGM's second biggest liability is world No. 1 Scottie Scheffler, the co-favorite at +500 along with McIlroy. Scheffler leads the field with 27.8 per cent of the money backing him to win this weekend, followed by McIlroy at 15.6 per cent.
The book's third biggest liability is LIV Golf's Bryson DeChambeau, who has drawn 13.0 per cent of the money while seeing his odds shorten from +2200 to +800.
"With Rory completing his grand slam in Augusta, bettors now turn to Jordan Spieth to do the same with a victory in the PGA Championship. Speith is the worst result for us, and not far behind is Scottie Scheffler fresh off a dominating performance at the Byron Nelson," BetMGM senior trader Matt Wall said.
"Bettors are also rooting for Bryson DeChambeau, as his odds have shrunk to +800 while the book is rooting for Rory to win, which is surprisingly a good result for us right now."
Scheffler is the biggest liability to be the leader after Thursday's first round, followed by DeChambeau and McIlroy. McIlroy finishing in the top five this week has been the most popular prop bet of the event.