Spain striker David Villa remains confident his team will progress to the last 16 despite a shock opening defeat to Switzerland.

Gelson Fernandes' goal seven minutes into the second half condemned Spain to a first loss to the Swiss in their history, causing the first major upset of the 2010 World Cup.

"We are annoyed by the result," said Villa. "We dominated possession and we were the better team. Nevertheless, we are convinced that we will go through to the next round."