LONDON - Super-confident challenger George Groves has vowed to knock-out champion Carl Froch with a left-hook on Saturday night at Wembley. Froch, known as the Cobra, defends his IBF and regular WBA super-middleweight titles against Groves in one of the most eagerly-anticipated rematches in boxing's recent history. Nottingham's Froch, 36, won by controversial ninth round referee's stoppage in Manchester last November. But now Londoner Groves, 26, says he will delight the 80,000-strong crowd at the national football stadium in the English capital with a spectacular finish. "It'll be the left hook that finishes Carl Froch on Saturday night," Groves said at the final pre-fight press conference. "Anyone who has watched the media workouts will know we've been working on left hooks and the left hook will work.”–AFP