Sergio Martinez KO Darren Barker in the 11th round. Cesar’s Palace in Atlantic City was the venue in which the fight was held. there are a lot of fights happening the same night and one of the match to watch is the fight between the middleweight champ Sergio Martinez and the undefeated Darren Barker. Darren Barker who was undefeated before this fight show good boxing skill in the first half but was just too conservative to do any vital damage to Sergio Martinez. Martinez took his chance and adjusted during the later part of the fight was taking over the fight, these gave him the opportunity to KO Barker.