Northampton cruised to a 38-15 bonus-point win over Treviso to keep themselves on course for a quarter-final spot.
Saints scored six tries in total, including four after the break, to seal a comfortable win.
Ludovico Nitoglia and Joe Carlisle scored for Treviso, who are still looking for a first win of the season.
Saints made a good start when their maul set them up perfectly on the Treviso line. In the end Samu Manoa proved too powerful and crashed over for the first try.
Stephen Myler added the conversion, but Treviso hit back midway through the half with three points from Carlisle.
Treviso were frustrating their visitors, but with eight minutes remaining in the half they were reduced to 14 men when Francesco Minto was sin-binned for tackling Lee Dickson from an offside position.
Northampton took advantage straightaway, again thanks to a powerful drive, with Alex Waller the man to emerge from the pile.
Myler missed the conversion, so Saints led 12-3 at the break but they put the result beyond doubt early in the second half with two quick tries.
Minto had returned and helped the Italian side stop a Saints maul, but when the visitors went through the phases, they were able to work some space out wide. Ben Foden needed no further invitation and sprinted over to stretch the lead to 16 points with Myler’s conversion.
The bonus-point score came from the restart, with Jamie Elliott initially making ground up the left wing. He then fed Calum Clark who in turn found Luther Burrell for a cracking try. Myler had found his range and added the extras.
That effectively ended the interest in the game, with Northampton assured of five points, but Treviso responded with a try of their own when Nitoglia got over after the ball was spread quickly. Carlisle converted to cut the deficit to 26-10 with 20 minutes remaining.
Northampton hit back with a penalty try as their pack marched their opponents back at a five-metre scrum, earning a penalty try in the process.
After Myler’s conversion, Saints kept pressing, but it was Carlisle who was next to go over, picking off a pass and racing 70 metres to score.
Saints were to have the final word though, with George Pisi scoring their sixth try after more good work from his forwards before the ball was spread wide.
The win put Saints top of their pool ahead of Racing’s clash with the Ospreys, and they’ll be hoping for five more points next week when the two sides meet at Franklin’s Gardens.
Tries: Nitoglia, Carlisle
Yellow cards: Minto, Acosta
Tries: Manoa, A. Waller, Foden, Burrell, Penalty, G. Pisi
Cons: Myler 4
Treviso: 15 Jayden Hayward, 14 Simone Ragusi, 13 Michele Campagnaro, 12 Sam Christie, 11 Ludovico Nitoglia, 10 Joe Carlisle, 9 Alberto Lucchese, 8 Dean Budd, 7 Alessandro Zanni, 6 Simone Favaro, 5 Antonio Pavanello (cpt), 4 Francesco Minto, 3 Salesi Manu, 2 Davide Giazzon, 1 Matteo Muccignat.
Replavements: 16 Amar Kudin, 17 Matteo Zanusso, 18 Romulo Acosta, 19 Marco Fuser, 20 Tomas Vallejos, 21 Marco Barbini, 22 Luca Morisi, 23 Edoardo Gori.
Northampton: 15 Ben Foden, 14 Ken Pisi, 13 Tom Stephenson, 12 Luther Burrell, 11 Jamie Elliott, 10 Stephen Myler, 9 Lee Dickson, 8 Samu Manoa, 7 Phil Dowson (cpt), 6 Calum Clark, 5 Christian Day, 4 Sam Dickinson, 3 Salesi Ma’afu, 2 Mike Haywood. 1 Alex Waller.
Replacements: 16 Dylan Hartley, 17 Ethan Waller, 18 Gareth Denman, 19 Courtney Lawes, 20 Tom Wood, 21 Kahn Fotuali’i, 22 George Pisi, 23 James Wilson.
Venue: Stadio Monigo, Treviso
Referee: Peter Fitzgibbon