First blood to Boca Juniors
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Boca Juniors secured a narrow advantage in the first leg of their Copa Libertadores last-16 tie with Corinthians as they won 1-0 in Buenos Aires.
Nicolas Blandi got the only goal in the 59th minute but Boca were left to finish the match with 10 men as substitute Pablo Ledesma was sent off with six minutes to go.
Ledesma collected two yellow cards just seconds apart, the first a caution for celebrating what proved to be a disallowed goal and then a second two minutes later for a crude challenge on Teles Ralf.
Gremio beat Colombian side Independiente Sante Fe 2-1 despite playing with 10 men for the last 37 minutes.
Eduardo Vargas put the Brazilian hosts ahead in the 28th minute but Independiente levelled when Cris brought down Jefferson Cuero in the area and Omar Perez netted from the spot.
Cris saw red for the challenge but the visitors could not capitalise on their man advantage and Fernando grabbed the winner with a low drive.