Northampton director of rugby Jim Mallinder was thrilled with his side's 25-20 win over Saracens in front of 27,411 supporters at stadiummk.
The result leaves the Saints five points ahead of Bath, with Saracens a further four points behind as Mallinder's side came from behind to win.
"It is a big win," he told Press Association Sport afterwards.
"Saracens disrupted our set-piece – the lineout didn't function quite as well as it normally does – but we managed to keep in the game and Stephen Myler kicked his goals.
"Stephen gets man-of-the-match in a lot of the big games he plays in. You need someone as reliable as him who can kick the goals in big pressure situations and can run the team.
"Billy Vunipola going off was a critical moment. We seemed to get on the front foot in the second-half, and I thought we dominated."
This win was much needed for Northampton after their heavy European loss to Clermont was followed up by an away defeat at Exeter in the Premiership.
"The Clermont game really disappointed us because we came a good second-best," Mallinder added.
"The Exeter game was slightly different. We looked at the game on the Monday and saw five or six chances that we basically blew, so we knew there were parts of our game that were still functioning well.
"This win is a big help in terms of trying to achieve that home semi-final.
"We will take the lads to Portugal for a few days now, and hopefully a bit more bonding and a bit of training, and hopefully prepare for four more games."