Greece face Costa Rica on Sunday in a round-of-16 clash no one predicted, but what can we expect from the tie?
Greece emerged from Group C with four points, behind a dominant Colombia side. Costa Rica's passage through Group D saw them emerge as the surprise group winners. They shocked the world with their 3-1 defeat of Uruguay and confounded expectations again by beating Italy 1-0.
Greece have grown into the tournament, saving their best football for the final 20 minutes of their victory over Ivory Coast.
But Greek head coach Fernando Santos insists his team can take nothing for granted against Costa Rica, as Sky Sports reported.
"We have to pay a lot of attention in this game, they came out top in the 'Group of Death,'" Santos said. "As a result, we cannot allow ourselves to underestimate them."
Here are some of the key clashes we can look forward to during this "battle of the underdogs."