Deco put the Portuguese ahead early on in Geneve but Libor Sionko equalized within nine minutes and the game looked to be heading towards a draw until Ronaldo produced a typical moment of magic to put his side back ahead just after the hour.

Sionko missed a good chance to draw the Czechs level for a second time but the former Rangers man headed over and substitute Ricardo Quaresma added a stoppage-time third for Portugal to ensure they maintained their 100% record.

Luiz Felipe Scolari named an unchanged side from the opening win over Turkey, while there were starts for English-based duo Marek Matejovsky and Milan Baros for the Czechs.

Karel Bruckner's men actually started the brighter of the two sides but it was Portugal who went ahead in the eighth minute. Ronaldo played a neat one-two with Nuno Gomes and, after Petr Cech had initially done well to save at the feet of the Manchester United winger, Deco scrambled home from close range.

Czech Republic instantly hit back, though, and Baros had already gone close with one header by the time Sionko dived to nod in Jaroslav Plasil's corner on 17.

Deco fired over as Portugal sought the lead again, while Cech was down well to keep out Ronaldo's low drive almost immediately after.

The Czechs threatened as well as the game swung from end to end, but they struggled to get a sight on goal and it was Ronaldo yet again who went close with two efforts just before half-time.

Portugal continued to look the more dangerous at the start of the second half but Gomes shot straight at Cech with their best opportunity eight minutes in.

The Chelsea keeper saved again, this time from Simao Sabrosa, just before the hour mark but he could do nothing in the 63rd minute when Ronaldo smashed Deco's cross low into the far corner with a crisp first-time effort from inside the box.

Jan Koller came on up front ten minutes later as the Czechs looked for an equaliser but it was his strike partner Baros who went close 12 minutes from time - the Portsmouth striker heading a cross well wide when Sionko was better placed behind him.

Sionko really should have earned his side a draw six minutes from time but he failed to get any real direction on his header and Ricardo was easily able to tip his tame effort over the bar.

Czech Republic poured forward in the dying moments but they were a dealt a sucker punch in the first minute of extra time when a long punt upfield released Ronaldo, who closed on Cech and simply squared for Quaresma to slide home into an empty net.