Mark Williams of Wales competes during the Round 1 match of 2013 Welsh Snooker Open against Liu Chuang of China at the Newport Center in Newport, south Wales, Britain, on Feb. 11, 2013. Williams won 4-1. (Xinhua/Wang Lili)

Liu Chuang of China competes during the Round 1 match of 2013 Welsh Snooker Open against Mark Williams of Wales at the Newport Center in Newport, south Wales, Britain, on Feb. 11, 2013. Liu lost 1-4. (Xinhua/Wang Lili)

Mike Dunn of England reacts during Round 1 of 2013 Welsh Snooker Open against his compatriot Judd Trump at Newport Centre in Newport, Britain, on Feb. 11, 2013. Judd Trump won 4-0. (Xinhua/Wang Lili)

Judd Trump of England competes during Round 1 of 2013 Welsh Snooker Open against his compatriot Mike Dunn at Newport Centre in Newport, Britain, on Feb. 11, 2013. Trump won 4-0. (Xinhua/Wang Lili)

Dominic Dale of England competes during Round 1 match of 2013 Welsh Snooker Open against Daniel Wells of Wales at Newport Centre in Newport, Britain, on Feb. 11, 2013. Dominic Dale won 4-1. (Xinhua/Wang Lili)

Daniel Wells of Wales competes during Round 1 match of 2013 Welsh Snooker Open against Dominic Dale of England at Newport Centre in Newport, Britain, on Feb. 11, 2013. Dominic Dale won 4-1. (Xinhua/Wang Lili)