Patrick Hertzong, AFP, Getty Images
Portuguese defender Jose Bosingwa fights for the ball with Czech midfielder Jaroslav Plasil (back) during the Euro 2008 Championships Group A football match.

GENEVA (AP) — Cristiano Ronaldo's first goal for Portugal since October was the winner in a 3-1 victory over the Czech Republic on Wednesday, moving the Portuguese to the verge of advancing to the quarterfinals of the European Championship.

Ronaldo's goal in the 63rd minute came off a brilliant pass by playmaker Deco, who scored Portugal's first goal. Substitute Ricardo Quaresma clinched it in injury time off a pass from Ronaldo.

That gave the Portuguese six points in Group A, with a game against co-host Switzerland to come.

Led by Brazilian coach Luiz Felipe Scolari, Portugal is trying to reach its second consecutive final at Euros. It was runner-up to Greece four years ago at home. It had another successful campaign at the World Cup in Germany two years later, losing to France in the semifinals.

The Czechs, who have three points and next play Turkey, got a goal on a header by Libor Sionko off a corner kick in the 17th . They beat Switzerland in their opener.

On Portugal's first goal, Ronaldo tried to exchange passes with Nuno Gomes. Goalkeeper Petr Cech intercepted the return with his leg and redirected it into Deco's path, leaving the diminutive midfielder to force the ball into the net from close range, the ball deflecting off defender Marek Jankulovski.

Portugal controlled possession, but often had trouble penetrating the Czechs.But midfielder Sionko equalized nine minutes after Decos scored with a strong header from in front of goal, beating Portugal's Armando Petit to the ball off a corner by Jaroslav Plasil.