Dimitrios Salpingidis struck in the second half to lead Greece to a 1-0 victory over Slovakia in a 2014 World Cup qualifier on Tuesday.
Salpingidis capitalized on a defensive blunder by the hosts to score the winner from close range in the 63rd minute at a time when Slovakia was putting the visitors under pressure.
Greece has 10 points from four matches and leads Group G together with Bosnia-Herzegovina, which beat Lithuania 3-0 in another qualifier on Tuesday. Slovakia is three points behind.
Slovakia captain Marek Hamsik came close several times but wasted his chances and Michal Braznanik hit the post of Orestis-Spyridon Karnezis' goal two minutes from time when the hosts were desperately seeking an equalizer.
Greece travels next to Bosnia-Herzegovina while Slovakia hosts Lithuania on March 22.
