The UFC is universally recognized as the preeminent mixed martial arts promotion on the planet. Therefore, UFC bouts usually see the best competing against the best. Of these top level fighters, who has seen the most success?
It is impossible to objectively evaluate which fighters have had more success based on past competition. Such a process allows for too much subjectivity when comparing the value of different wins.
To avoid such subjectivity, the rankings in this article are based on each fighter's record over .500 (wins minus losses). This process is more effective than simply comparing winning percentages because it factors in longevity.
Also, since any fighter with a better winning percentage but fewer wins above .500 than another fighter would have to win more than half of his fights to catch up, this list assumes that it is impossible to assume such success. For example, if fighter A is 11-3 (eight games over) and fighter B is 7-0 (seven games over), although B has a much better winning percentage, B would have to 4-3 in his next seven fights to match A; it is impossible to assume such success (see Brandon Vera).
For tiebreakers, overall winning percentage will be considered (7-0 > 9-2).