RIO DE JANEIRO, April 7 (Xinhua) -- Damian Bobadilla scored in the second half as Sao Paulo clinched a 1-0 away win over Boston River in their opening Copa Sudamericana group match on Tuesday.

Paraguayan midfielder Bobadilla broke the deadlock just after the hour by dancing into the box and lashing a low drive into the far corner.

The hosts controlled less than a fifth of the total possession and managed only one shot on target.

Elsewhere, Gonzalo Sosa, Gaston Martirena and Adrian Fernandez scored as Argentina's Racing Club eased to a 3-1 win at Bolivia's Independiente Petrolero.

Veteran midfielder Thomaz was on the scoresheet for the hosts after converting a penalty on the stroke of halftime.

Elsewhere, Tigre drew 1-1 at Alianza Atletico, O'Higgins won 2-0 at home to Millonarios and Barracas Central was held to a 0-0 home draw by Vasco da Gama. ■