Wasps only drew with Harlequins in a match which ended 29-29. Nick Easter scored Quins first try from a simple switch with fly-half Nick Evans before Andy Powell crossed on his debut for Wasps.
Tom Varndell streaked away to put Wasps in charge after Rikki Flutey’s break, while Evans and Mark van Gisbergen were on target with the boot throughout.
Mike Brown’s converted second-half try gave Quins a three-point lead but a late Wasps penalty cancelled it out.
The game was a tight affair throughout, characterised by Evans and Van Gisbergen’s exchanges with the boot.
Easter’s try came after two minutes when Evans ghosted past Simon Shaw from a line-out to feed back inside for the England number eight to coast in under the posts.
The former All Black added the conversion and after the Wasps full-back opened his account Evans quickly re-established Quins seven-point gap with a penalty of his own.
Powell’s try, after some good work from Varndell and skipper Tom Rees, was converted to bring the scores level.
Flutey marked his return to Wasps by turning provider when he deftly gathered Jordan Turner-Hall’s spill from a tackle and found Varndell with his offload.