10. Juan Manuel Marquez

HOMETOWN: Mexico City
RECORD: 52-5-1 (38 KOs)
COMPLEX SAYS: The current WBA, WBO, and The Ring Lightweight World Champion has built a reputation for himself with his defense and counter-punch skills. He's taken both Manny Pacquiao and Floyd Mayweather 12 rounds in hard fought bouts. Scoring a draw and later losing a controversial split decision to Pacquiao (who he still wants another shot at) then losing a unanimous decision to Mayweather. This is your brain. This is your brain when Marquez' fists connects with it. Yikes.