#4. Nassourdine Imavov - UFC middleweight contender

Nassourdine Imavov is now four fights into his UFC career and is just starting to pop up on people's radars. While the French fighter has exclusively fought in the middleweight division since joining the promotion, prior to signing, he had spent the majority of his career competing at welterweight.
Imavov went 8-2 prior to joining the American company, with only one of those bouts coming at 185 lbs. He also won the only title of his MMA career at welterweight. The success he's had in both weight divisions suggests he is better placed to achieve this unlikely double than most.
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For the moment, Imavov is ranked No.12 in the middleweight division and is coming off the back of two consecutive TKO victories. At just 25 years old, he certainly has a bright future ahead of him.
#3. Movsar Evloev - UFC featherweight contender

Movsar Evloev is another fighter who changed weight divisions upon signing with the American promotion. The Russian fighter won the M-1 Global bantamweight championship but has since made the move and has gone 5-0 in the American promotion's featherweight division.
Evloev is currently a perfect 15-0 and is ranked No.13 in the featherweight division. He's even picked up a win in a catchweight bout at 150 lbs. This puts him in a somewhat unique scenario in that he is clearly capable of having success at weight both above and below 145 lbs.
Evloev is only 27 years old meaning he still has plenty of time ahead of him. He was scheduled to fight Ilia Topuria at UFC 272 but has since withdrawn from the bout. Hopefully we get to see him return to the octagon before too long.