Renowned gambler Billy Walters writes in his book that Phil Mickelson wagered more than $1 billion in the last 30 years. Walters’ book is due out on Aug. 22. The Fire Pit Collective obtained the excerpt and its stunning allegations. They include Walters telling of a conversation in which Mickelson wanted him to bet $400,000 for him on the Americans winning the 2012 Ryder Cup. Mickelson played on that team. Walters says he talked him out of it. Mickelson said in a statement Thursday that he never bet on the Ryder Cup. Walters was sentenced to five years in prison for an insider trading case that involved Mickelson as a relief defendant.