ROCKET Ronnie O'Sullivan secured his place in the quarter-finals of the World Championships with a sublime 147 against Mark Williams, writes James Randall .

The former Wanstead High School pupil had secured 9-7 lead overnight - completed the victory with a faultless session today, were he did not drop a frame.

Breaks of 71 and 60 added to the lead before a 100 took him to the brink, before saving his best until last.

The last frame maximum not only secured the Ongar residents place in the last Eight, but earns him £157,000 maximum prize.

O'Sullivan told BBC Sport: "Obviously it's more important to win the game but that money gives me a few options in the summer. I'll be getting a Bentley Convertible now - I've been dying to get one."

He added: "As soon as I got on the first red I thought that I had to go for the 147."

O'Sullivan will now face the winner of the second round tie between China's Liang Wenbo and Northern Ireland's Joe Swail.

The loss has moved Williams out of the top 16, and as a result means he will now have to qualify for next years competition.

O'Sullivan said of his opponent: "I expected Mark to really make it count because he's a big game player. I had packed my bags because I thought it was one of those games that was going to get away from me."