Wasps consolidated their position as Pool Three winners in the Amlin Challenge Cup with a narrow 20-19 victory at Newport Gwent Dragons.
Wasps were already assured of a quarter-final place but were eager to improve their ranking for the next round by completing the double over Darren Edwards' Dragons, who lost 38-25 at Adams Park.
The visitors' Nicky Robinson scored 15 points with a try, two conversions and two penalties. Wasps also scored a penalty try
Tom Prydie opened the scoring with a 16th-minute penalty but Wasps were soon level as Robinson added three points five minutes later.
Dan Evans was first to get over the line, despite the attentions of flanker Sam Jones, Prydie converting to give the Dragons a 10-3 lead in the 26th minute.
But Robinson added three more penalty points before ensuring Wasps took the lead in the 36th minute, the Wales fly-half adding the extras following a penalty try award.
Prydie levelled on the stroke of half-time and kicked the hosts ahead in the 52nd minute but Dai Young's men were not ready to give up.
Five minutes later, Robinson collected his own grubber to dot down for the first time before making sure of the conversion. A period of attrition followed, with Prydie missing a penalty, but replacement Steffan Jones would narrow the deficit to a single point with six minutes to play.
Elsewhere, Farid Sid ran in two tries and Gilles Bosch added 10 points with the boot as Perpignan beat Rovigo 40-22 to take a five-point lead in Pool Two.