LONDON (Reuters) - Mexico's key playmaker Giovani dos Santos is out of Saturday's Olympic soccer final against Brazil at Wembley with a knee injury, coach Luis Fernando Tena confirmed on Friday. "The injury is not a serious one but it is serious enough to keep him out of the match," Tena said at his pre-match briefing with reporters. "He lives in London, he plays for a team in London and naturally had a dream of playing for the gold medal for Mexico in London, but the dream is over for him. ... More...