Switzerland defender Reto Ziegler believes the team's solid organisation will be a major factor in helping it qualify for the knockout stages.
The Swiss sprang a surprise 1-0 win over favourite and reigning European champion Spain this week and the former Tottenham left-back felt its pragmatic approach was key.
"I think our strength is the organisation of the team. They had a lot of ball possession but we knew that [would happen] before the game," he said.
"I think the difference was in the organisation of Switzerland. We played well and we were more aggressive in the one against one.
"They wanted to play well against us but it was hard for them."
The Sampdoria defender said that victory had given the Swiss confidence to
face fellow Group H leaders Chile on Tuesday morning (AEST).
"Beating Spain is a good feeling. The first game in the tournament is always hard so we are all proud to have won this game against one of the best teams in the world," he added.
"Now we have to concentrate on playing well against Chile because it's not good to win against Spain and then play a bad game the second time.
"We know we did something big and we all proud for the country but now we have to concentrate against Chile this will be another hard game."
Spain hero Andres Iniesta claims he never lost faith in achieving FIFA World Cup success, despite a frustrating season with injuries and a bad start for Vicente del Bosque's side in South Africa.