In a sensational turn of events German midfielder Michael Ballack has declared himself fit for tonight's World Cup opener against Costa Rica. Ballack, who had been ruled out of the game with a calf injury by coach Jurgen Klinsmann only 24 hours ago, now looks set to play some part in the game. The German captain had come under fire from the media in his home country, having apparently shown a lack of professionalism in dealing with the injury he picked up in Germany's 3-0 defeat of Colombia. Now Ballack wants to prove his critics wrong.