Robertson - the third generation of his family of his family to represent the Socceroos behind father, Mark, and grandfather, Alex - was unlucky not to find the target, producing three close chances for the home side. 

Colby Bishop nabbed the game's only goal in the 70th minute, before Robertson received a standing ovation ten minutes later after a commanding first start for Portsmouth. 

Will Norris then produced a brilliant stoppage time save to help secure a second-straight league win for Portsmouth.