The Potters enjoyed the better of the first half but were unable to convert the opportunities that came their way, with John Ruddy making saves to deny Jon Walters, Dean Whitehead and Peter Crouch.
Tony Pulis' men continued to press after the break and Etherington struck in the 72nd minute after collecting the ball from substitute Cameron Jerome, who had flicked on a throw-in it appeared the hosts had been fortunate to be awarded.
Source: PA
Source: PA