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Summary Estudiantes at the top with 15 points from eight matches.
Substitute striker Lucas Viatri dived to head home a last-minute winner giving Boca Juniors a 2-1 victory over champions Estudiantes at the Bombonera in the Argentine Clausura championship.Bocas victory ensured their bitterest rivals River Plate, who won 1-0 away to Quilmes, joined Estudiantes at the top of the standings with 15 points from eight matches.Estudiantes and River are one point ahead of Godoy Cruz, who beat Huracan 3-1 in Mendoza, Velez Sarsfield, who won 2-1 at Olimpo on Saturday, and unbeaten Argentinos Juniors, 2-0 winners at Banfield on Friday.Unmarked Uruguayan striker Rodrigo Lopez gave Estudiantes an early lead when he shot first time past stranded goalkeeper Cristian Lucchetti before Juan Roman Riquelme equalised with a brilliant free kick in the 16th minute, when he curled the ball over the wall packed in front of the goal and past a diving Agustin Orion.
