Wasps have moved ahead of Harlequins in Pool Two of the European Rugby Champions Cup, after a clinical 23-3 victory at The Stoop.
They took the lead through an Andy Goode penalty, before winger Christian Wade capitalised on a Harlequins handling error to run the length of the pitch to score the game's first try.
Wasps extended their lead shortly after, when Joe Simpson threw a clever dummy before breaking through the Harlequins defence to score a second try after 20 minutes.
Goode added another penalty after half time, before the hosts finally got on the score board in the 45th minute through a Ben Botica penalty.
Elliott Daly kicked a long-range penalty to regain a 20-point lead for Wasps, which they held until the end.