1. Roberto Duran vs Sugar Ray Leonard

In their infamous rematch, Duran’s air of invincibility evaporated when he turned his back and said ‘no mas’.

  1. Oliver McCall vs Lennox Lewis

McCall refused to engage and began to cry before the fight was ended in the fifth. It transpired that McCall was suffering with a mental illness.

  1. Andrew Golota vs Mike Tyson

After being dropped and dominated, Golota retired from the fight at the end of the second round, having suffered numerous injuries.

  1. Victor Ortiz vs Marcos Maidana

In a see-saw war, Ortiz quickly found out he may have bitten off more than he could chew and admitted to quitting the fight afterward.

  1. Nicholas Walters vs Vasyl Lomachenko

After seven dominant rounds from Lomachenko, Walters realised his chances of victory were minute and decided to pack it in.

  1. Vitali Klitschko vs Chris Byrd

Ahead on all three cards, Klitschko had no choice but to quit on his stool due to a nasty shoulder injury.

  1. Michael Gomez vs Peter McDonagh

Gomez took a series of unanswered punches in the fifth, went down, then left the ring while the referee was still counting.

  1. Luis Collazo vs Keith Thurman

Having worked his way back into the fight, Collazo then elected to not continue after the seventh.

  1. Dwight Muhammad Qawi vs George Foreman

Returning former champion Foreman outmuscled Qawi and forced him to quit on his feet in the seventh.

  1. Lucas Matthysse vs Viktor Postol

The fearsome Matthysse was broken down and dropped in the 10th, though he elected to stay on one knee for the entire 10 count.