Harlequins survived a late fightback to beat an error-prone Northampton Saints at Twickenham Stoop.
Jack Musk, Lennox Anyanwu and Luke Northmore eased Quins into a 21-3 lead before Lewis Ludlam's try pulled Saints back to 21-10 at half-time.
Musk crossed again with Saints' Lukhan Salakaia-Loto in the sin-bin, but Tommy Freeman's try kept them in it.
Cadan Murley took the hosts clear at 35-15 before tries from George Furbank and Tom James set up a tense finale.
More to follow.
Harlequins: Marler (c), Musk, Louw, Lamb, Herbst, Kenningham, Evans, White, Care, Smith, Murley, Anyanwu, Northmore, Marchant, Green.
Replacements: Riley, Garcia Botta, Kerrod, Hammond, Jurevicius, Gjaltema, Allan, David.
Northampton Saints: Furbank, Freeman, Dingwall, Hutchinson, Collins, Biggar, Mitchell, Iyogun, Matavesi, Petch, Salakaia-Loto, Coles, Scott-Young, Ludlam (c), Augustus.
Replacements: Haywood, Heffernan, Hill, Moon, Graham, James, Proctor, Sleightholme.
Sin-bin: Salakaia-Loto (43).
Referee: Christophe Ridley
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