May 4, 2013 // 9 p.m. ET (Showtime PPV)
MGM Grand, Las Vegas
Translated from Spanish, "Guerrero" means "warrior," and this one honors his surname. Guerrero often has fought under extreme duress, including while hurt or troubled by his wife's health problems. When he made the jump from 135 pounds to 147 and stood up to a heavy puncher in former titlist Selcuk Aydin, Guerrero showed uncommon heart. Much like the durability question, we just don't know how Mayweather would respond to serious adversity because he has so rarely faced it in the ring.
Written by Bernardo Pilatti