Putting together any run of victories or avoiding defeat match after match is a herculean task in the unpredictable world of mixed martial arts.
Achieving such a feat at the highest level of the sport is even more difficult. Even MMA greats like B.J. Penn and Randy Couture struggled to put more than three or four wins together.
However, there is something to be said for picking your opponents carefully. Throughout this list there are fighters whose claim to the greatest streak in MMA rests on crushing cans and avoiding the toughest fight.
The order of this list is, therefore, not based on the fighters who remained undefeated longest, but the ones who remained undefeated in the face of serious competition.