Two goals conceded and a missed penalty cost Guiseley during the first half and they weren’t able to recover from it.
The visitors who lost for the first time in the league since mid September the previous Tuesday, started brightly, with Craig Dundas forcing Guiseley keeper Jonny Maxted into a smart reflex save.
The next attack brought the first goal as Dundas was found following a corner and he made no mistake with a simple finish from five yards out.
United weren’t finished with their attacking play and should have doubled their lead when a well worked move led to Nicky Bailey having a shot blocked by a returning Alex Purver who was back from a hamstring injury.
The hosts were handed a big chance to move level when awarded a penalty for an alleged hand ball. Lee Molyneux took it but United keeper Jamie Butler dived the right way and made the save.
Sutton would soon be 2-0 up as a ball over the top found Tom Bolarinwa who got in front of the last defender and flicked it into the net.
The second half started like the first with Dundas having a chance when a ball across the face of goal found the striker, who stretched and just missed the target.
Next up was Kieron Cadogan to test Maxted, as he beat his defender and was one on one but his low drive was well blocked. He would then produce a good run but fired over when well placed.
Efforts from the hosts’ Mike Fondop and Kevan Hurst were saved quite comfortably by Butler.
The keeper would then tip an Andy Howarth effort onto the post – in what proved to be the only time he was tested from open play – as the visitors got the win and a clean sheet as well.
Lions boss Paul Cox said: “It’s disappointing to lose at home, the way we did. I can’t accept that performance, the buck stops with me and I know the improvements that need to be made.”
Ten-man FC Halifax Town came from 3-1 down to salvage a 3-3 draw against 10-man Eastleigh in a dramatic game at The Shay.
A disastrous five-minute spell saw Sam Matthews find the net straight from a corner and Chris Zebroski head in from another corner.
Scott McManus’ penalty, got Halifax back into a contest they’d easily had the better of.
Sam Johnson was sent off just before the hour mark, and from then on there looked no way back, especially when Simon Heslop added a third.
But McManus’ excellent cross was converted by Tom Denton before Eastleigh keeper Ross Flitney was also dismissed for a second booking.
There was one last twist when substitute Dan Batty drove in after a good run and pass by Josh Macdonald.
Bradford Park Avenue will travel to Stourbridge tonight for an FA Trophy third round qualifying replay after being held 1-1 at home.
Kyle Perry headed the Midlanders ahead, before Nicky Clee levelled after Matthew Gould parried Oli Johnson’s strike.
The latter kept Avenue in the tournament by clearing a Leon Broadhurst header off the line.
Joe Leesley (two) and on-loan Bradford City defender Lachlan Barr earned Harrogate Town a 3-2 triumph at Darlington on Friday night with Reece Styche getting the home side’s goals.