Costa Rica and Greece are all square in their World Cup last-16 clash following a low-key first half at the Arena Pernambuco.
It was the Central Americans who managed to get away the first shot of the night, with Bryan Ruiz sliding a pass out to Christian Bolanos, whose effort from a tight angle flew over the bar on eight minutes.
Shortly after, Lazaros Christodoulopoulos beat two men as he cut inside from the left flank, before dragging his long-range attempt wide of the target.
Greece started to enjoy more of the ball as the half progressed, and Giorgos Karagounis came close to opening the scoring when he struck the ball from 25 yards out, but Keylor Navas did well to handle just short of the half-hour mark.
Navas was called into action once more before the interval, this time to deny Dimitris Salpingidis's first-time finish at the back post with a superb stop to ensure that the scores remained level at the break.
