Scott Styris and Daryl Mitchell scored at a run a ball clip through the middle overs to make the result look more respectable, but with no Knights batsman able to put the ball over the fence the target was never really under threat.
In a near replica of Thursday's match, the Knights had earlier got off to a great start with the ball.
The visitors opted to bat, but Pollard, Michael Papps and Grant Elliot were all back in the hut inside six overs with the score at just 36.
That brought together Stephen Murdoch and James Franklin, who crafted the day's best partnership to tilt the contest into the Firebirds' favour.
Murdoch was run out for a brisk 57 thanks to some slick work from Anton Devcich and BJ Watling, but by the time Franklin departed in the final over, the Knights had a formidable total to chase.
Wellington Firebirds 145/6 (Murdoch 57, Franklin 46; Scott Kuggeleijn 2/25, Jono Boult 1/21) beat Northern Knights 124/9 (Daryl Mitchell 31, Scott Styris 29; Graham Napier 3/18, Brent Arnel 2/28).