Exeter Chiefs have beaten Premiership champions Harlequins in a thrilling game at Sandy Park.
Rob Baxter's men scored five tries to win by 42 points to 28.
Brett Sturgess scored the first try of the match in the 12th minute, but the visitors hit back to lead 18-16 at half-time.
Two second-half Jason Shoemark tries in five minutes was added to by tries from Ben White and Sireli Naqelevuki.
Gareth Steenson also kicked 17 points.