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Justin Thomas is a two-time major champion and one of the best golfers in the world, but who is his caddie?

Thomas is one of the most accomplished American golfers in the last decade and has added multiple PGA Tour titles to his two major wins at the PGA Championship.

And Thomas also has one of the most experienced and most successful caddies in the world.

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Jim “Bones” Mackay, who was on Phil Mickelson’s bag for 25 years, is Justin Thomas’ caddie.

Mackay split with Mickelson in 2017 and began working as a commentator for NBC and the Golf Channel.

But he picked up Thomas’ bag in 2021 after the player parted company with his old bagman Jimmy Johnson.

Johnson had seen Thomas rise to the very top of the game and was on the bag when he won his first PGA Championship crown in 2017.

He had also worked for the likes of Nick Price, Adam Scott and Steve Stricker.

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Mackay, who first began caddying for Mickelson back in 1992 and won five majors in a garlanded stint, is one of the most venerable figures on the PGA Tour.

He helped Thomas win his second major, the PGA Championship at Southern Hills in 2022.

When asked after that win why he wanted to team up with Thomas, Mackay said: “Because I really like him … and I think he’s got more shots than anybody on the tour.

“I’m not saying, you know, he’s, you know, this or that. I’m saying in his arsenal of shots, he’s got more shots than anybody I’ve seen out here currently—high, low left, right … whatever. Hands around the green, the guy’s really, really good. And I wanted to be around it.”

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