In the world of mixed martial arts, few things are more frustrating to hardcore fans than fighters who squander obvious potential.
Back in the old days, various UFC competitors could ultimately be forgiven for being underachievers. Unless your name was Randy Couture, Tito Ortiz or Ken Shamrock, you likely weren't getting paid that much in the first place.
But with fighter endorsements, decent paychecks and access to better training methods, it's strange to see clearly talented athletes who just can't get it together.
Here's a look at the 10 biggest underachievers in UFC history, the ones who have continually held themselves back from true greatness due to their own habits or shortcomings.