Just days removed from the biggest fight of his life, IBF interim champion Sharmba Mitchell is brimming with confidence. Mitchell, who faces undisputed junior welterweight champion Kostya Tszyu in an eagerly anticipated rematch this Saturday night told Boxingtalk.com, . "I'm going to handle my business. I'm going to knock him out." Tszyu-Mitchell II airs live on Showtime at 9 PM ET Saturday Night!