Phil Mickelson has wagered more than $1 billion over the last three decades and wanted to place a $400,000 bet on the 2012 Ryder Cup while playing for Team USA, according to a much-anticipated book by renowned gambler Billy Walters. The stunning betting estimates Walters provides — from his own detailed record from what he describes as two reliable sources — are detailed in an excerpt of Walters' book, "Gambler: Secrets from a Life of Risk.” It is schedule to be available Aug. 22. The FirePit Collective obtained an except of the book.