Eight-time champion Ronnie O'Sullivan withdraws from the Masters, which starts on Sunday, for the second year in a row on medical grounds.

Ding Junhui of China competes during the first round match against Leo Fernandez of Ireland at 2017 UK Snooker Championship in York, Britain on Nov 28, 2017. Ding Junhui lost 5-6. [Photo/Xinhua] ...