Spain coach Vicente del Bosque has said beating the hosts Brazil will be the biggest challenge they face in the Confederations Cup.
The former Real Madrid boss has guided La Furia Roja to an undefeated run of 16 games this year with their last victory coming in a 5-1 friendly win over Panama.
And despite Brazil being far from their best, Del Bosque believes they could well prove to be the toughest team that they face in the tournament.
He told reporters: "Everyone says Brazil are not at their best, but personally I think they will be the team to beat."
Spain were drawn against Uruguay, Tahiti and the winner of the African Cup of Nations 2013 in the group stage and the 61-year-old insists they will not be taking any of their opponents lightly.
"As we have won the World Cup and European Championship, there is a lot of expectation and responsibility surrounding us. What we have to do is make sure we are ready and respect every other team," he said.
"Uruguay finished fourth in the World Cup two years ago. Whenever I have seen an African side play they have done well and we have to show Tahiti respect."