Snooker: Williams executes controversial four-cushion break before loss to Selby at World Snooker Championship

Mark Selby cruised into the World Snooker Championship final four after winning 13-3 against Mark Williams. Despite producing a bizarre four-cushion break-off shot, three-time champion Williams was defeated after Selby reeled off four frames in a row. He will face Stuart Bingham in the semifinals.