Four great fighters, all of them world champions, three of them at more than one weight class, retired from the sport this year: heavyweight king Wladimir Klitschko, super-middleweight and light-heavyweight ruler Andre Ward, four-weight ruler Miguel Cotto and light-welterweight and welterweight champ Tim Bradley.
Video: Top 10 Heavyweights by decade
Ranking fighters across different eras is a tricky business. Who was the greatest heavyweight of … read more