Georges St-Pierre is considered by many to be the greatest MMA fighter of all time, but there are a pair of intriguing matchups against others in that GOAT conversation that we never got the chance to see. St-Pierre, who ruled the welterweight division during his historic title reign, is often compared to the two men who ruled the divisions on either side of the scale; Khabib Nurmagomedov at lightweight and Anderson Silva at middleweight. Recently, St-Pierre admitted these are two matchups he always wanted , but never came to fruition. Related In their primes, Michael Bisping thinks Anderson Silva would have beaten Georges St-Pierre Video: Where does Khabib Nurmagomedov rank in the all-time GOAT conversation?