Bradley: We don't know how Sergio Martinez's knee will hold up against Cotto

(Photo credit: Sumio Yamada) By Allan Fox: Former two division world champion Tim Bradley isn't quite sure if WBC middleweight champion Sergio Martinez's knee is going to hold up under the pressure that Miguel Cotto (38-4, 31 KO's) puts on him in their fight on Saturday. Martinez had surgery on his right knee during the […]