Conor McGregor had his first professional MMA fight 14 years ago today.

UFC superstar Notorious began training at Straight Blast Gym in Dublin under coach John Kavanagh in 2008.

The Irish sensation - who is the highest-paid athlete in the world according to Forbes - turned pro aged just 20.

Back then, McGregor was still a fresh-faced youngster who had barely started shaving and didn't have any tattoos.

The 33-year-old made his debut under the Cage of Truth banner, winning in two rounds against Gary Morris in Ireland, before starting a journey which would see him win two belts in two divisions in two different promotions in the space of six years.

In the second round, McGregor stepped on the gas and stopped his opponent with a flurry of punches, improving his record to 1-0 in the process.

The Irishman won 12 of his 14 opening bouts overall - winning two Cage Warriors belts as well - before being signed by the UFC in 2013.

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On April 6, 2013, McGregor made his octagon debut against Marcus Brimage in a featherweight three-rounder.

He won the fight via a first-round TKO to announce himself on the world stage.

It was only upwards from thereafter as he quickly made a name for himself with five wins under his belt before challenging for the title two years later.

Again, McGregor only needed two rounds to knock out Chad Mendez for the vacant interim featherweight title.

DUBLIN, IRELAND - OCTOBER 22: Conor McGregor meets fans at a Reebok UFC Combat Gear retail event held at JD Sports on October 22, 2015 in Dublin, Ireland. (Photo by Clodagh Kilcoyne/Getty Images for Reebok)

DUBLIN, IRELAND - OCTOBER 22: Conor McGregor meets fans at a Reebok UFC Combat Gear retail event held at JD Sports on October 22, 2015 in Dublin, Ireland. (Photo by Clodagh Kilcoyne/Getty Images for Reebok)

He then went one better by knocking out Jose Aldo just 13 seconds into the first round of the main event of UFC 194 in December 2015 to become the undisputed featherweight champion.

It proved to be the Dubliner's last fight at featherweight as he has spent the rest of his career since competing in the weight classes above.

The following year he was originally supposed to challenge Rafael dos Anjos for the UFC lightweight title.

But the Brazilian was forced to pull out due to injury leaving Nate Diaz to step in on just 11 days notice - and McGregor moved up to welterweight instead.

However, McGregor suffered a shock defeat at the hands of Diaz in Las Vegas in March 2016, before winning a rematch in Sin City five months later on points.

But he did eventually return to lightweight to challenge Eddie Alvarez for the 155lbs belt to become the first man to hold two titles at the same time.

After a brief foray into boxing, it's been pretty downhill since then, with McGregor losing three of his last four fights to Dustin Poirier and Khabib Nurmagomedov.

But it's easy to forget all that he achieved in such an incredibly short amount of time, especially considering where he came from.