Before two-sport king Regian Eersel defends his ONE Lightweight Kickboxing World Title against Alexis Nicolas in the main event of ONE Fight Night 21 on Prime Video, relive both his epic battles with kickboxing great Nieky Holzken! #ONEFightNight21 | Apr 5 at 8PM ET ???????? Watch Live on Prime ???????? Watch Live on Sky Sports ?? Live TV broadcast in 190+ countries (check local listings) ?? Also available on ONE YouTube and ONE Facebook (geo-restrictions may apply) ?? Also available on Watch.ONEFC.com (geo-restrictions may apply) ??? Tickets ?? bit.ly/ofn21tix Follow the athletes on Instagram: Regian Eersel: https://www.instagram.com/koolhydraat/ Mustapha Haida: https://www.instagram.com/niekyholzken/ Subscribe and turn on notifications to get the latest ONE content: http://bit.ly/ONECHAMPIONSHIP To watch ONE events in most regions, visit: https://watch.onefc.com To watch ONE events in the U.S. and Canada visit: https://www.primevideo.com To shop official ONE gear, visit: ht