#1. Alexander Gustafsson

A fighter through and through, Alexander Gustafsson is the top man in the Lightweight Division who could possibly face Jon Jones upon his return to the company.
The two have battled before, and on that occasion at UFC 165, Jones won the UFC Light Heavyweight Title from Gustafsson after a knockabout five-round fight.
Get the latest updates on One Championship Rankings at Sportskeeda and more
The fact that he lost has only encouraged Gustafsson to train harder, and prepare himself for a rematch against Jones.
Prior to Jones' return, no one has called out the fighter as much as Gustafsson. Currently possibly poised for a UFC Light Heavyweight Title Match at UFC 230, if Gustafsson wins the fight, he is sure to get the rematch against Jones that he has so craved for.