CAPE TOWN, South Africa, June 28 (Xinhua) -- Spain defender Sergio Ramos is confident ahead of their second round clash with Portugal, but conceded that to stop their rivals they must stop Cristiano Ronaldo. Tournament favorites Spain will face the 2006 semi-finalists on Tuesday evening in Cape Town. Ramos is confident about the Spanish squad despite losing the first group match to Switzerland. "We hope the trouble we had in the group stage will make Spain a stronger team," Ramos said. "We are pleased with our performances so far and happy to have finished top in the group after the start we had." "Portugal are a great team and they are in top form. I am looking forward to playing against teammates and friends Cristiano Ronaldo and Pepe. Let's see if we can make it to the quarterfinals," said the 24-year-old Real Madrid side-back. Ramos, who will confront with Ronaldo, believed that the key to beating Portugal lay in how well he can deal with the world most expensive footballer. "Cristiano is very fast, strong and a speedster with the ball at his feet. I have to prevent him from receiving the ball and we must stop him from having a lot of room to work with," said a determined Ramos.