Northampton consolidated their place at the top of Pool 4 of the LV= Cup after victory over Leicester.
First-half tries from Saints duo Paul Diggin and Alan Dickens helped seal victory with Billy Twelvetrees responding for the Tigers.
Twelvetrees also kicked two penalties either side of half-time for Leicester.
But two conversions and a couple of penalties from Stephen Myler as well as a late kick from Barry Everitt rounded off a deserved victory for Northampton.
Northampton Saints coach Dorian West tells BBC Radio Northampton:
"It was a bit of a scrappy game, but our aim was to qualify and we've done that. We've won four out of four and we've got to be pleased.
"In front of our home crowd, it's a good place for us to play. We're enjoying our run here.
"We'd done some analysis on Leicester and identified some weaknesses in their defence. We exposed them twice and scored two good tries."
Leicester coach Richard Cockerill: "We acquitted ourselves very well.
"In the first half we controlled matters but with bits of ball they scored two soft tries.
"It was disappointing to do this but we scored a great try thanks to Lucas Amorosino - but those daft errors in defence cost us.
"We should have made more of our opportunities and in the second half we should have set up a grandstand finish had we scored again but we didn't take our chances at that stage."
Northampton: Reihana, Ashton, Ansbro, Mayor, Diggin, Myler, Dickens, Tonga'uiha, Sharman, Mujati, Fernandez Lobbe, Kruger, Best, Easter, Wilson. Replacements: Downey for Mayor (52), Everitt for Myler (73), Dickson for Dickens (41), Long for Sharman (73), Cannon for Fernandez Lobbe (58).
Not Used: Parkins, Waller, Giles.
Leicester: Amorosino, Tuilagi, Twelvetrees, Mauger, M. Smith, Vesty, Ellis, Stankovich, T. Youngs, White, Hemingway, Kay, Pienaar, Woods, B. Deacon. Replacements: G. Murphy for Amorosino (58), Staunton for Mauger (67), Grindal for Ellis (58), R. Harris for Stankovich (67), Duffey for T. Youngs (50).
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