Mirror: Why Atletico Nacional are upsetting all the odds in the Copa Libertadores

For the new season, MirrorFootball is teaming up with some of the blogosphere’s best new writers to bring you even more great football reads every single day. Saturday is South America day, and here’s Valderramarama’s Ed Malyon with his take on the week’s big issues in Argentina. *** The 2012 Copa Libertadores – South America’s Champions League – is under way, and it’s as unpredictable as ever.