#The Margin: Phil Mickelson allegedly tried to bet $400,000 on a Ryder Cup he was playing in

Golf star Phil Mickelson has gambled more than $1 billion on football, basketball and baseball over the past three decades, a forthcoming book claims.

Professional gambler and Las Vegas businessman Billy Walters alleges in a book due out on Aug. 22, “Gambler: Secrets from a Life of Risk,” that Mickelson placed hundreds of bets with him for exactly $220,000 and 1,115 bets for precisely $110,000 over the span of three decades. What’s more, Walters estimates that Mickelson lost more than $100 million on his bets during the multidecade…