Boxing promoter Eddie Hearn uncharacteristically tweeted about UFC superstar Conor McGregor back in 2015, and his message has been proven exactly right.McGregor, now a household name, began his MMA career in 2008, but rose to fame after his prolific win over Jose Aldo in December 2015, spectacularly winning with a knockout just 13 seconds into the first round.In 2016, the Irishman suffered a shock defeat to Californian Nate Diaz, before securing the win in a rematch later that year.McGregor, also known as The Notorious, achieved superstardom in 2017 when he fought in the infamous crossover bout with boxing legend Floyd “Money” Mayweather Jr.Mayweather, considered by many to be the greatest boxer of his generation, won the fight by TKO in the 10th round, taking his record to 50-0.McGregor is thought to have pocketed a nine-figure salary for the fight, secured thanks to his success in UFC.In July 2015, sports promoter Hearn tweeted: “Don’t really follow UFC but what a character this McGregor is – for any sport to thrive you need big personalities and he is a revelation."Promoter Hearn sent the tweet the day after McGregor beat fellow star Chad Mendes in what has become a trademark early second round knockout for the Irishman to win the UFC Interim Featherweight Championship belt.Of course, it is clear now that Eddie Hearn’s words were spot on as McGregor has catapulted the UFC and MMA into worldwide sports.

Known the world over for his exuberant and animated personality, McGregor entertains millions with his controversial press conferences and weigh-ins ahead of his fights, and his stunts away from the arena.

He has become a crowd favourite with millions of people tuning in to his latest UFC fight with Russian Khabib Nurmagomedov, which he lost via a fourth round submission.

The Notorious doesn’t always toe the line, though, as his exploits in April this year outside the Barclays Centre in New York proved.

He stormed the arena and attacked a bus carrying UFC fighters, including Nurmagomedov, damaging it and eventually resulting in the Irishman avoiding a prison term, but getting community service instead.

No matter what your thoughts are, though, about the infamous Conor McGregor, there’s no denying that he has propelled his sport into the mainstream and achieved mega stardom along the way.

Hearn was right when he sent that tweet back in 2015, the only question now is where can he find boxing’s McGregor equivalent, or has he already in Anthony Joshua?