MARK Williams was tonight knocked out of the World Snooker Championship at the hands of a ruthless Ding Junhui who completed a demolition job on the Cwm potter with a session to spare.

The pair started the second session with Williams 6-2 behind. That quickly became 10-2. Williams did take frame 13 but the match ended with the final frame of the session, Ding Junhui clinching it 13-3 to be the first man into the semis.