Rory McIlroy's post-round press conference in Memphis was drifting to a close when he was asked about Billy Walters' revelations about Phil Mickelson's gambling.
In 'Gambler: Secrets from a Life at Risk' Walters reveals that Mickelson gambled more than $1 billion on US football, basketball and baseball in the past 30 years but it was the suggestion that he tried to put on a $400,000 bet on the US Ryder Cup team to win at Medinah that was perhaps the most eye-catching.
