Goalkeeper Keylor Navas was the hero for 10-man Costa Rica as the nation reached the quarterfinals of the World Cup for the first time in their history after beating Greece 5-3 on penalties in Recife.
Bryan Ruiz's second-half goal was cancelled out in injury time by Sokratis Papastathopoulos to send the game to extra time and then penalties, before Theofanis Gekas saw his spot kick saved and Michael Umana put away the winning penalty for Costa Rica.
Los Ticos have been the tournament's surprise package in Brazil, overcoming Uruguay and Italy before holding England to a goalless draw as they won Group D.
That dream run continued in Recife on Sunday as they rode their luck against Greece to win a tense clash at the Arena Pernambuco to set-up a quarter-final clash against the Netherlands.
Los Ticos were struggling to replicate the form they had shown in the group stage but managed to open the scoring with their first shot on target, as Bryan Ruiz directed home in the 52nd minute.
Costa Rica should have had a penalty soon after and were reduced to 10 men after 66 minutes, with Oscar Duarte's sending-off eventually telling in stoppage-time as Sokratis Papastathopoulos struck to take the match into extra-time.
Substitute Gekas turned wide, Kostas Manolas headed over and Karagounis wasted a free-kick as the game looked to have got away from them, only for Papastathopoulos to net a stoppage-time leveller.
Greece coach Santos was sent to the stands before the spot-kicks began, with every one finding the net until Navas denied Gekas with Greece's fourth of the night.
It gave Umana the opportunity to secure victory, which he duly did by firing the ball into the top right-hand corner.
