Phil Mickelson’s former caddie shows who he really is with act on 18th green at U.S. Open.

Jim ‘Bones’ Mackay had been on the call with NBC Sports this weekend while making a veteran move to aid JJ Spaun’s caddie who had forgot something after the American’s unlikely U.S. Open win.

Phil Mickelson’s former caddie Jim ‘Bones’ Mackay helped out JJ Spaun’s bag man in Mark Carens after picking up the 18th flag for him following his incredible win at the U.S. Open.

Spaun came into the major as a 120/1 underdog, having never come close to challenging for a title throughout his 13 years on the PGA Tour. But throughout the four days he was able to compete with the likes of Robert MacIntyre, Viktor Hovland and Tyrrell Hatton to win his first major.

The rain had fallen heavily at the Oakmont setup, with many of the big names struggling with the conditions, as Spaun was able to play at a high level before going on to cause the huge upset and winning. The win is only his second ever as a PGA Tour member. This had come just a few months after what was his best ever career performance, where he finished second at The Players Championship, behind Rory McIlroy.

Spaun and Carens celebrated their incredible achievement on the 18th, something that they could have only dreamed of heading into the week – but forgot to pick up the 18th flag as a memento.

The winning caddie regularly takes the flag for his golfer, but Carens was otherwise engaged as the pair celebrated the victory.

But minutes after they had left the 18th hole, Mackay was seen with the flag before later giving it to Carens in a classy move from a former caddie.

Mackay has been working as a commentator for NBC Sports since parting ways with Mickelson in 2017, although he returned to caddie for Justin Thomas from then until 2024.

He earned widespread praise on social media for handing the flag to Carens during the celebration with Spaun.

Spaun entered the final round as one of the top contenders, especially as many of the leaderboard’s stars struggled throughout the day.

He too faced early setbacks, bogeying his first three holes and again on the fifth and sixth, casting doubt on his chances of winning.

However, Spaun mounted a comeback with impressive birdie putts on the 12th and 14th, even as Bob MacIntyre closed the gap after a bogey on the 15th.

Spaun then birdied the 17th and reached the green on the 18th, needing to sink a 65-foot putt to avoid a playoff and secure the win.

Against the odds, he made the long putt in one stroke, clinching a dramatic and memorable victory.