It was a slow start to the ONE Championship 51 main event, but middleweight champion Vitaly Bigdash ended up finishing strong when he earned his first title defense and remained undefeated in his career with a dominant victory over Aung La N Sang . Bigdash (9-0) methodically broke Sang (19-10) down over the course of five rounds before winning the online-streamed pay-per-view fight by unanimous decision at Jakarta Convention Center in Jakarta, Indonesia, marking his first successful 185-pound defense after winning the belt in a 2016 “Fight of the Year” contender with Igor Svirid in October. The first two rounds of the contest were slow on action and eventful happenings.