In
Boxing, SD is the short term and type via. Split Decision. In
boxing and for other combat sports, a split decision is when 1 of the 3 judges gives it in favour of one fighter. While the rest give the favour to the other fighter. Split decisions are usually seen as controversial victories. And many Split decisions can end up overturned and will usually
hand a rematch between the two competitors.
There are multiple
famous split decision (SD) matches one of them Is in 1987 when Marvin "Marvellous" Hagler fought Sugar Ray
Leonard. and another in
2007 when Oscar De La Hoya fought Floyd Mayweather being the closest Floyd ever came to a defeat.