Arsenal de Sarandi won the first league title in their 55-year history on Sunday, following a 1-0 win over bottom club Belgrano in Argentina's Clausura Championship.
Arsenal benefitted from closest rivals Tigre being held to a 2-2 draw at home to Independiente and Boca Juniors losing 3-1 at All Boys on the final day of the season to win the title by two points.
Defender Lisandro Lopez was the hero of the day for Arsenal, scoring in the 27th minute with a volley from a Luciano Leguizamon corner.
Meanwhile, Tigre went into their encounter with Independiente level on points with leaders Arsenal. However, two goals from Independiente's Patricio Rodriguez meant Tigre had to settle for a draw and second place.
In Brazil, defending champions Corinthians beat Palmeiras 2-1 in the Campeonato Brasileiro in Sao Paulo, which moves them within a point of safety from the relegation zone.
At the other end of the table, Cruzerio managed to muster a 3-1 win against Vasco da Gama to go top of the Brazilian league.
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