Paul Leeman and Ollie Cahill challenge for the ball

O'Keefe scored with a neat finish past Glens goalkeeper Michael Dougherty.

Richie Baker had two early chances for the visitors and at the other end striker Gary Hamilton had a shot well saved by Dan Connor.

Gary Browne provided the cross for Jason Hill to fire in a first time shot but Connor was again equal to the task.

The Glens created little in the second half and their chances of semi-final qualification now appear to be over.