Brazil manager Dunga is confident that his side will improve on an average display in their 2-1 victory over North Korea in their opening game at the World Cup finals.
Goals from Maicon and Elano gave the Selecao the win in Johannesburg, but they were far from convincing against the Group G outsiders.
He told reporters: "The start is the most difficult match, you have a long wait for this and the anxiety builds up. I'm not entirely happy, but this is common in football.
"When we come across a team that is also offensive it creates the necessary space, but it is very difficult against some teams to develop a counter-attack.
"North Korea passed extremely well and defended extremely well, but nevertheless Brazil were able to create a number of opportunities."