#3 Georges St-Pierre
Georges St-Pierre is one of the best fighters of all time. His run in the UFC is possibly unparalleled. There is not a single fighter who is better in the Octagon than GSP on his day, which makes him the ideal rival for the undefeated Lightweight Champion.
GSP himself has admitted that he was previously not interested in fighting Nurmagomedov as there was hardly anything which he could have gained from the fight.
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However, since then, Nurmagomedov had his fight with McGregor and was able to defeat the Irish fighter. This gained him quite a bit of notoriety and further added to his reputation.
A fight against GSP would be perfect for Nurmagomedov as it would help cement his legacy as one of the greatest to have ever entered the Octagon.