Newly-promoted Cerro Porteno PF bounced back from their heavy opening day defeat in the Paraguayan Apertura with an impressive draw against Clausura champions Olimpia.
Cerro, who were beaten 4-1 by Sol de America in their first top-flight match, performed admirably against Olimpia and deserved more than a point from the goalless draw.
The hosts tormented Olimpia from the first whistle, with Rogerio, Sergio Samudio and Leonardo Delvalle causing regular problems for the defence.
Only a string of fine saves from goalkeeper Martin Silva rescued a point for the visitors, who rarely threatened to break the deadlock.
Elsewhere, Sol De America scored four goals for the second week running as they won 4-2 at Independiente de Campo Grande.
Enzo Prono got the visitors off to a dream start when he scored with just a minute on the clock but Indy hit back through an Osvaldo Diaz penalty.
Reinaldo Ocampo restored America's lead in the second half and although Francisco Garcia again equalised, Edgar Segovia and Jose Ortigoza both struck to ensure victory for the league leaders.
Cristian Menendez's goal on the stroke of half-time was enough for Libertad to beat Sportivo Luqueno 1-0 while Rubio Nu are the only other side with a perfect record after two Claudio Correa strikes saw them past Guarani 2-1.
Cerro Porteno left it late to win 2-1 at Deportivo Carapegua, with Pedro Benitez netting deep into injury-time, and Nacional Asuncion beat Tacuary 2-0 thanks to goals from Marcos Riveros and Carlos Ruiz.