Rory McIlroy has a new man on the bag this week at the USPGA - Harry Diamond - but who is he?

Who Is Rory McIlroy’s New Caddie Harry Diamond?

Unless you’ve been on Mars for the last two weeks, you will know that Rory McIlroy has got himself a new caddie.

It was announced that the four-time major winner parted ways with his long-time bagman JP Fitzgerald in the lead up to the WGC-Bridgestone Invitational.

The pair had worked together since 2008, through McIlroy’s four majors wins, three Ryder Cup wins and his 95 weeks as world number one.

The 28-year-old said of the split, “sometimes to preserve a personal relationship you have to sacrifice a professional one.”

rory mcilroy shoots three under with new caddie Who Is Rory McIlroy's New Caddie Harry Diamond?

McIlroy and Diamond got off to a great start at the WGC-Bridgestone Invitational. (Photo by Sam Greenwood/Getty Images)

“JP has been a huge part of my life for the past decade, but I was getting very hard on him at times.

“I would say he is still one of my closest friends. We started together in 2008, we’ve had a lot of great times on and off the golf course.”

McIlroy’s new caddie, at least for the WGC-Bridgestone Invitational and this week’s USPGA Championship, is Harry Diamond, who is his childhood best friend.

Related: Rory McIlroy ‘inundated’ with new caddie requests

The pair had a great first week together, finishing in a tie for fifth at the Bridgestone.

WATCH: Rory McIlroy hits 300+ yard drive in a space suit

McIlroy is yet to decide whether his and Diamond’s partnership will continue after the USPGA.

“I have a week off, and then I can reassess how these couple of weeks have went with Harry on the bag, and then we’ll see what I do for the playoffs after that,” he said.

Who Is Harry Diamond?

Harry Diamond is Rory McIlroy’s childhood best friend, who has been living quite the lifestyle since his four-time major winning mate took the golfing world by storm.

The pair met at Holywood Golf Club and Diamond was a very good amateur, even representing Ireland.

What’s more, Diamond was best man at McIlroy’s recent wedding where he married Erica Stoll.

Here he is celebrating McIlroy’s 2014 Open win with the family…

@RoryMcIlroy on Twitter

Here he is playing Augusta National with Rory…

2 sleeps 😃

A post shared by Harry Diamond (@haza136) on

Aboard the private jet after McIlroy’s 2014 USPGA win…

@RoryMcIlroy on Twitter

With Floyd Mayweather…

#mayweather

A post shared by Harry Diamond (@haza136) on

Continues below



Jack Nicklaus…

Happy Birthday Mr Nicklaus 🎂 What a man for 76 years of age!!

A post shared by Harry Diamond (@haza136) on

Tiger Woods…

#tbt

A post shared by Harry Diamond (@haza136) on

With McIlroy and Niall Horan…

Toronto 🇨🇦

A post shared by Harry Diamond (@haza136) on

With Federer and Nadal at Wimbledon in 2011…

#TBT #Wimbledon2011 #Federer #Nadal #Legends

A post shared by Harry Diamond (@haza136) on

Flying private with Rory to the Players Championship…

Next stop The Players Championship! #Jacksonville #Sawgrass

A post shared by Harry Diamond (@haza136) on

At the Ricky Hatton vs Manny Pacquiao fight in Las Vegas in 2009, with JP Fitzgerald…

#TBT #Vegas #May09 #Boxing #MGMGrand #HattonPacquiao #Electric #TheBank

A post shared by Harry Diamond (@haza136) on

Follow Golf Monthly on Facebook, Twitter and Instagram