Brothers Michael, two, and Harris Gaitatzis were Olympic's heroes after Manly led at halftime with a goal by former A-League striker Chris Payne.
Manly, which is sitting second from bottom of the NSW Premier League, fought hard against a team that is in the top six.
It had a strong first half but when Olympic stepped up a gear after the break its class in attack became the big difference.
The spirit of the cup was evident in the very first exchanges with bone-crunching tackles the order of the day as both teams sought an early supremacy in front of a boisterous crowd of about 5000.
The home side got its desired breakthrough after nine minutes when Payne broke clear through the middle of Olympic's square defence and patiently waited for goalkeeper Paul Henderson to commit himself before he expertly planted the ball into the net.
Payne was causing Olympic all sorts of problems with his movement on and off the ball and when he won a free kick on the edge of the penalty area Manly had a chance to double the score but Brendan Cholakian fired over the bar.
Olympic finished the half with a major share of possession but Manly defended vigorously, limiting the former national champion to long-distance shots.
From one of 2014 world cup jerseys these efforts, however, Michael Gaitatzis was unlucky with a dipping shot that just missed the bar.
he second half followed the same pattern as Olympic pushed more men forward in search of an equaliser and Manly relying on breaks.
Goalkeeper Dylan Mitchell had a rather comfortable evening but 10 minutes in he had cheap soccer jerseys to come out of his goal to thwart Ryan Kerr.
Olympic was not to be denied and it drew level on the germany world cup 2014 jersey hour when a loose ball came to the unmarked Gaitatzis at the far post who found the net with ease.
Olympic went ahead in the 74th minute when Harris Gaitatzis finished of a well-worked move Argentina world cup jersey with a chipped shot that beat Mitchell.
Any hopes Manly may have had of saving the game were dashed two minutes later when Michael Gaitatzis slotted the ball home with a low shot to the far corner.
