Ifill latched onto a goalmouth scramble and hit a shot from the right hand side of the area that rocketed into the roof of the net.
The winger had problems with the pools of water on the pitch all night and it was certainly not a game for the connoisseur.
Meanwhile, Cambridge surprised their hosts when Richard Logan gave them a first half lead.
Midway through the second period, Tom Youngs pounced for the killer second goal which gave the visitors all three points.
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