SAO PAULO, May 2 (Reuters) - Libertadores Cup favourites Atletico Mineiro took a big step towards the quarter-finals with a 2-1 away win over 10-man Sao Paulo in the first leg of their last 16 tie on Thursday. Jadson gave Sao Paulo an early lead at the Morumbi with Ronaldinho equalising just before halftime. Diego Tardelli scored the winner in the 60th minute. It was the third meeting between the Brazilian rivals in the competition and sweet revenge for Atletico, whose perfect record in the group phase was ended when Sao Paulo beat them 2-0 two weeks ago. ... More...