Jose Aldo
Aldo is arguably the greatest featherweight in MMA history. The Brazilian held the WEC and UFC championship belts for over eight years with unprecedented success. However, one career-defining moment made everybody forget about his previous brilliance. This career-defining moment came when he fought Conor McGregor in 2015.
Aldo and McGregor went on a long and grueling promotional tour that saw McGregor infuriate the King of Rio. Finally, the fight arrived and Aldo threw caution to the wind. He stormed forward but McGregor caught him with a vicious left hook and finished him in under 15 seconds. It was an incredible moment that shocked the world (via MMA Fighting).