After blasting out onto the scene after a successful Amateur Career, which included a blistering performance in the Walker Cup, Rory McIlroy emerged as the best of a new generation of elite golfers which included Jason Day and Rickie Fowler.
Now, there is a new kid on the block and he's not letting anyone get in his way.
Since the demise of Tiger Woods, the game was lacking a dominant force as Lee Westwood, Martin Kaymer, Luke Donald and Adam Scott had their name posted at the top of the World Golf Rankings.
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Then along come the level headed Northern Irishman who took the number one spot and hasn't looked back for the past 48 weeks.
However, times have changed. A young man named Jordan Speith won his second career major and more impressively, the second major of 2015. Now the American is breathing down McIlroy's neck.
It has been no surprise to myself and the avid golf enthusiast that Speith is now a multi-major winner at 21-years-old. Racking up two wins on the PGA Tour in 2013 and 2015, is most impressive, but being able to hold your nerve in a play-off situation is short of remarkable.
At the John Deere Classic in 2015, he held of former Masters champion, Zach Johnson and in the 2015 Valspar Championship, he exacted his revenge on Patrick Reed who had beaten him in a play-off in the 2013 Wyndham Championship.
Speith went into the 2015 Masters as second favourite to McIlroy, having won the month before, as well as finishing second at Augusta the previous year. He did what McIlroy failed to do in 2011, by taking the iconic Green Jacket, after having lead through the first three rounds.
The US Open was a similar story with the young Texan being second favorite to McIlroy. However after some consistent golf, he was crowned US Open champion thanks to a gift from Dustin Johnson's three putt on the final hole.
However it does show that Spieth can handle arguably one of the toughest links golf tests on the planet, which stand put him in good stead to make it three out of three of the major championships in 2015.
When you are at the top, you are there to be got at and McIlroy is no exception. If he's not winning, people know about it. He has managed to achieve two top tens, in the first two majors of the year but he has always left himself with too much to do to catch Speith.
Missed cuts at the BMW PGA and Irish Open pile on to the fact that Rory isn't at his best. BBC Sport reports that the former victorious Ryder Cup Captain, Paul McGinley has told Rory to "step up to the plate" and welcome the charge from Speith.
However with Rory's fantastic record at St Andrew's, don't think the world's number one is out of the running for the British Open just yet. But could injury put paid to his hopes? McIlroy has undergone surgery on an Achilles injury he sustained while playing football with friends and is now serious doubt.
Have the stars aligned for Speith? Victory once more could be the making of a legend.
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