Billy Sharp's penalty was the winner for Sheffield United as they moved into the quarter-finals of the Emirates FA Cup, after Alfie Mawson was sent off. Follow @EmiratesFACup on Twitter for in-game highlights and match updates! https://twitter.com/emiratesfacup Subscribe: https://www.youtube.com/thefacup To find out more about The Emirates FA Cup visit: TheFA.com/EmiratesFACup The Emirates FA Cup on Facebookhttps://www.facebook.com/EmiratesFACup/ The Emirates FA Cup on Instagram https://www.instagram.com/emiratesfacup/