Worcester (7) 23
Tries: Havili (2), Brown
Pens: Brown (2)
Dragons (0) 10
Worcester's EDF Energy Cup win over the Dragons was marred by a serious-looking injury to Gavin Quinnell.
The former Wales lock was taken off on a stretcher in great pain after hurting his knee in a first-half ruck.
Aisea Havili scored tries in each half to put the hosts on their way to a win in a dead-rubber Group D encounter.
James Brown also crossed, and kicked eight points, as the Dragons were limited to a converted Nic Fitisemanu try and a Ceri Sweeney penalty.
Worecester director of rugby John Brain on Gavin Quinnell's injury:
"Gavin's got a medial ligament strain, but the swelling has to go down before it's scanned."
He added: "I think defence probably won us the game and it was clearly defence that did the trick just before halftime.
"Had they scored then and we'd turned around 7-7 it would have been a different game.
Dragons head coach Paul Turner:
"The crucial point was just before half time. I thought a few of them were going to the sin-bin.
"I felt we matched them physically, which was key to our training during the week and we came to terms with their line-out.
"We came to terms with the line-out but there were too many handling errors and the game disappeared from us."
Worcester: Best; Havili, Rasmussen, Lombard, Tucker; Brown, M. Powell; Morris, Fortey, Taumoepeau, Collier, Gillies, Horstmann (capt), Harding, Hickey.
Replacements: Gotting, Windo, Bowley, G. Quinnell, R. Powell, Drahm, Avramovic.
Dragons: Wyatt; Fussell, N. Brew, Williams, A. Brew; Hercus, Walker; Black, Daly, Corsi, Hall, Charteris, Evans, Charvis (capt), Ringer.
Replacements: Maule, Sweeney, Cooper, Harrison, Crawford, Griffiths, Fitisemanu.
Referee: T Bedows (RFU)