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#2. Conor McGregor - former UFC double champ
Conor McGregor made his UFC debut in 2013 and soon established himself as the biggest superstar in the history of the MMA promotion. The Irishman became the highest-paid UFC fighter and revolutionized the sport in a very significant way, even making mainstream sports athletes envious.
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Conor McGregor made history in 2016 when he became the first UFC fighter to hold titles in two weight divisions simultaneously. His wins against Jose Aldo and Eddie Alvarez became the highest points of his MMA career so far.
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The turning point for Conor McGregor was his loss against Khabib Nurmagomedov at UFC 229. While 'The Notorious' wasn't a stranger to defeat, his mauling at the hands of 'The Eagle' changed him for good. Many experts believe that the submission loss to Nurmagomedov humbled McGregor.
He returned to action in 2020 against Donald Cerrone, and brought in a completely changed demeanor. Perhaps the antics he engaged in in the lead up to UFC 229 and the resulting loss got to him. His rematch against Dustin Poirier at UFC 257 again saw 'The Notorious' turn into a 'Mr Nice Guy' and suffer the first knockout loss of his MMA career.
Conor McGregor switched back to his old ways following his TKO loss, but that couldn't help him as he fell 1-2 against 'The Diamond' at UFC 264. Worse still, he also suffered a freak leg-injury that is set to put him out of action until next year.
#1. Ronda Rousey - former UFC women's bantamweight champion
Ronda Rousey was one of the most dominant champions the sport of mixed martial arts has ever seen. Over the course of her impressive 12-fight undefeated streak, only one of Rousey's opponents, Miesha Tate, managed to survive the first round against her.
Ronda Rousey's historic run came to a dramatic end at UFC 193, when Holly Holm landed a head-kick that became one of the top knockout highlights of the decade. Following her first MMA loss, Rousey was no longer seen as invincible. Trying to set things right, the Judoka Olympian made a comeback at UFC 207 against the new UFC women's bantamweight champion Amanda Nunes.
When the two fighters entered the octagon, it took Nunez just 48 seconds to dispatch Rousey. The first-ever female UFC Hall of Famer hasn't returned to the sport since suffering these two losses.
It was the upset loss against Holly Holm that put Ronda Rousey on the path to her decline. After a failed comeback attempt against Nunez, the former UFC champion decided it was time to call it quits and follow other pursuits.
