The day after the prop was posted at the Westgate sportsbook, a bettor placed a $5,000 wager to win $6,500 on Koepka to go over 7½ majors at plus 130.
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The golfer misses the cut Friday at the PGA Championship, and sportsbooks won’t have to sweat out a large number of bets that he would win the 2019 Grand Slam.
The Masters champion is the 8-1 favorite to win the PGA Championship, the year’s second major, which begins Thursday at Bethpage Black in New York.
Wisconsin resident James Adducci placed a $100,000 bet at SLS Las Vegas on Wednesday on the golfer to win the next three majors at 100-1 odds and complete the 2019 Grand Slam.