?SUBSCRIBE http://bit.ly/SSBoxingSub Ahead of their undisputed world title fight on Saturday, we look back at Savannah Marshall's stunning victory over Claressa Shields at the 2012 World Championships. ?TWITTER: https://twitter.com/skysportsboxing ?FACEBOOK: http://www.facebook.com/skysportsboxing ?WEBSITE: http://www.skysports.com/boxing MORE FROM SKY SPORTS ON YOUTUBE: ?SKY SPORTS FOOTBALL: http://bit.ly/SSFootballSub ?SKY SPORTS BOXING: http://bit.ly/SSBoxingSub ?SKY SPORTS CRICKET: http://bit.ly/SubscribeSkyCricket ?SOCCER AM: http://bit.ly/SoccerAMSub ?SKY SPORTS F1: http://bit.ly/SubscribeSkyF1 ?SKY SPORTS: http://bit.ly/SkySportsSub ?SKY SPORTS GOLF: https://bit.ly/SubscribeSkySportsGolf