Justin Thomas credits caddie ‘Bones’ Mackay for US PGA comeback win | Ewan Murray

The playoff winner at Southern Hills credits Phil Mickelson's former caddie for motivating him to fight back on day four

It remains unclear whether Phil Mickelson will emerge from exile when Greg Norman and his Saudi Arabian circus rumbles into Hertfordshire next month. Mickelson presumably has enough on his mind without contemplating the bitter irony of events at Southern Hills on Sunday. Nonetheless, to others it was striking that as Mickelson - the defending champion - sat at home in San Diego, a man once key to his success was instrumental in Justin Thomas claiming a second US PGA Championship.

Relations between Mickelson and Jim Bones" Mackay are understood to be non-existent despite 25 years of professional association. Mackay was on the bag as Mickelson won five of his six major championships. Having stepped back from bagcarrying duties and while working in television, Mackay decided privately that the only player for whom he would return to the game was Thomas. The call arrived last September; eight months on, Thomas has doubled his tally of major victories. I think he has more shots than anyone on tour," Mackay says of his employer.