BUENOS AIRES, Argentina (AP) Nicolas Lodeiro's first-half goal lifted Boca Juniors to a 1-0 victory at bitter Buenos Aires rival River Plate on Sunday.

Lodeiro, who came on as substitute in the first minute for injured Fernando Gago, scored the deciding goal in the 19th minute for a victory in the so-called Superclasico that pushed Boca into first place in the Argentine first division.

A preliminary report said Gago may have ruptured his Achilles tendon.

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''It's not easy to win here,'' said Boca forward Carlos Tevez, speaking of River's Monumental Stadium.

Tevez rejoined his boyhood club Boca this season after playing for a decade in Europe.

Boca leads with 52 points in 24 matches, two clear of San Lorenzo and six in front of Rosario Central. Racing Club is nine back with defending Copa Libertadores champion River Plate 11 off the pace, the same as Independiente.

In other results Sunday, Rosario Central and Newell's drew 0-0 in a tense derby match in Rosairo. Estudiantes and Gimnasia drew 1-1 and Colon and Union drew 0-0.