Ronnie O'Sullivan made a winning return in his first major tournament for nine months with a 6-5 victory over Mark Williams in the Masters first round.


Five-time world and Masters champion O'Sullivan took a break from the sport after last April's World Championship.


Trailing 4-2, he won three straight frames before securing his place in the quarter-finals after Williams missed a plant in the dramatic decider.


O'Sullivan will face Mark Selby, who thrashed Ricky Walden 6-0.


Selby, who has won the title three times, was in stunning form, making breaks of 71, 113, 66 and 81 to go through.