Phil Mickelson bet more than $1 billion on football, basketball and baseball over the last three decades and even allegedly attempted to place a $400,000 wager on Team USA in the 2012 Ryder Cup in which he participated, according to an upcoming book by renowned professional gambler Billy Walters.
Excerpts of the book "Gambler: Secrets from a Life of Risk" were first reported Thursday by Fire Pit Collective and provide the most detailed look yet at Mickelson's sports gambling and his relationship with Walters, a Las Vegas businessman who is widely considered to be the most successful American bettor ever.