What does it take to be champion? To be the best you have to beat the best. Before that though, a fighter has to prove he or she even deserves the chance. Timing, the strength of the division and previous loses can all play crucial roles in determining who a champion will defend their title against. Underdogs can and have won titles before. An underdog may have little or no chance of defeating the betting favorite, but they have proven that they are the best choice to take that chance. Have these five fighters earned their shot at greatness?