#2. Dustin Jacoby - UFC light heavyweight
Dustin Jacoby is in the midst of his second run with the UFC. The American first competed for the company back in 2011 but was released after going 0-2. He was given a second chance at UFC and is making the most of it, currently sitting at 6-0-1 in his second spell with the promotion.
In between his two runs with the biggest organization in MMA, Jacoby spent plenty of time in GLORY kickboxing. He competed for the organization 15 times, going 7-8. The highlight of his time there was a five-fight winning streak, including two tournament wins that earned him a title fight which he lost by decision.
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Jacoby has looked incredible since returning to the octagon and his unbeaten run has earned him the No. 14 spot in the light heavyweight rankings. His current run of form will likely earn him the opportunity to take on a fighter above him next time out and give him the chance to break into the division's top 10.
#1. Alex Pereira - UFC middleweight
Many MMA fans know that Alex Pereira was a decorated kickboxer, but few appreciate just how successful he was in that sport. He had 15 fights for GLORY kickboxing, winning 11. He also captured both the middleweight and light heavyweight titles during his time there.
While his MMA debut saw him suffer a surprising loss, he has not tasted defeat since and has now put himself in pole position to challenge for the title. His opponent in that bout will be a familiar one in Israel Adesanya, whom he defeated twice in kick-boxing fights for a different promotion: Glory of Heroes.
Pereira is arguably the most decorated kick-boxer we have ever seen step inside the octagon and the results thus far have been devastating. While his fight against Adesanya will be his toughest to date, you imagine it will be a largely kick-boxing style fight which could bode very well for the Brazilian.