London Welsh (12) 29
Tries: Drauniniu, Hills Cons: Thomas 2 Pens: Thomas 5
Worcester Warriors (17) 33
Tries: Sanderson, Benjamin, Garvey Cons: Carlisle 3 Pens: Carlisle 2, Goode 2
Sanderson made the scoresheet on his return from injury
Worcester ran in three tries as they edged a topsy-turvy Championship clash against London Welsh.
Warriors held a 17-12 advantage at half time, with tries from Pat Sanderson and Miles Benjamin cancelling out Aled Thomas' four penalties.
After the break, Joshua Drauniniu and Michael Hills went over and Thomas' boot added seven points for the hosts.
But Marcel Garvey replied with a try and kicks from Joe Carlisle and Andy Goode helped to seal the win.
London Welsh: Claassens, Gibson, Tonga'uiha, Whatling, Drauniniu, A. Thomas, Runciman, Pittman, Ma'asi, Ward, Purdy, Corker, Mills, Hills, Taione.
Not Used: Breeze, Lahiff, Powell, Russell, Lewis, Sampson, Shabbo.
Worcester: Arscott, Garvey, Crockett, Rasmussen, Benjamin, Carlisle, Williams, C. Black, Shervington, Douglas, Kitchener, Gillies, Best, Sanderson, Horstmann.
Not Used: Lutui, Taumoepeau, Rawlinson, Balding, Frost, Goode, Short.
Ref: Andrew Small (RFU).