Spain coach Luis Aragones is satisfied with his side's group in the World Cup but said on Saturday they should do their best. Aragones' side were drawn in Group H alongside with Ukraine and Arab sides Saudi Arabia and Tunisia. "Theoretically, Spain and Ukraine are the favorites to advance to the knock-out stage," Spanish daily Marca quoted Aragones as saying. "But theories don't always work, we have to demonstrate our quality on the pitch. Playing easy games in the beginning will give us the chance for better preparation." However, the Spanish coach warned of underestimating their opponents. "In the coming period, we need to carefully study our competitors especially Tunisia and Saudi Arabia," he said.