#1 Alexander Volkanovski vs. Arnold Allen

Volkanovski is coming off a dominant performance against fellow undefeated fighter Jeremy Kennedy, where Volkanovski got the TKO finish in the second round. Volkanovski is one of the best up-and-comers coming out of Austrailia and arguably one of the better unranked featherweights currently active.
Arnold Allen is 3-0 in the UFC and had the chance to make it 4-0 just like Volkanovski when he was set to fight Enrique Barzola January 20th for UFC 220. However, visa issues played spoilsport and led to his ouster. Allen is another top prospect and one of the best UK based featherweights.
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You can easily see Volkanovski get a ranked opponent in his next bout and he would very much deserve it. With that being said, a match-up with Allen would without a doubt catapult the winner into the top 15. Both are ready take step up in terms of competition and a fight between the two would surely be a solid affair.