The Central Coast Mariners have climbed to third in the A-League table by inflicting a third home defeat of the season on Sydney FC.
Former Australia international Mile Sterjovski scored the only goal of the game on 58 minutes.
Sterjovski's hopeful shot from 25 yards found the net via a huge deflection off the elbow of Matt Jurman.
The Mariners are now unbeaten in four matches, while Sydney are winless in five.