Mark Selby thrashes Ronnie O'Sullivan to end the Rocket's unbeaten run

World number one O’Sullivan had looked pretty much untouchable this season, with four major ranking titles already.

However, it was Selby, himself a four-time world champion, who produced a high-quality display with half-century breaks or higher in five frames to end O’Sullivan’s 16-match unbeaten run.

There had been a controversial start to the match in the opening frame when referee Desislava Bozhilova failed to warn O’Sullivan after a second missed attempt when he could see one side of a red.

She swiftly realised her error, apologised to both players and promptly informed the world number one he would forfeit the frame if he did not hit a red with his next shot.

O’Sullivan’s response was to smash into the reds, opening up the table which allowed Selby to eventually clinch the frame with a break of 65.

Selby, who will play either China’s Zhang Anda or John Higgins in the semi-finals, soon built early momentum following a clearance of 91. After O’Sullivan did not make the most of a chance in the third, another break of 81 further extended his advantage.

It was turning into a vintage display from the Jester from Leicester, who produced another fine break of 105 to go into the mid-session interval in complete control at 4-0.

Following the resumption, O’Sullivan continued to make some wayward shots, going in off a red and into the top pocket as Selby went on to take the fifth frame with a 59 clearance.

The Rocket finally kicked into gear in the next frame with a break of 58, only to run out of position and then see an attempted safety shot back up the table edge the green to leave a red on.

Following couple of tense exchanges, Selby sunk a long red at pace into the bottom left corner and then dropped in a deft final red after O’Sullivan had left it just over the pocket before clearing the colours to take the frame 70-58, completing a memorable win.

“To beat Ronnie in any tournament is a great scoreline, to beat him in the way I did, I am very, very pleased. It was more or less faultless,” Selby said on ITV4.

“It is a huge game and if you cant get up for matches like that, you might as well put your cue away.

“I felt confident I could win, because if you don’t then more often than not the scoreline will be the other way.

“The biggest thing for me is that when I am not winning I try to tweak things, but the two performances I have put in here have proved to me that what I am doing now is what I need to carry on doing, whether I win or lose.”

During Thursday’s afternoon session at the International Centre, Northern Ireland’s Mark Allen came through a marathon four-hour contest to beat Gary Wilson 6-4.

Allen, celebrating his 38th birthday, moved into an early 2-0 lead after two half-century breaks and went into the interval 3-1 ahead with a run of 75.

Wilson, who won the BetVictor Welsh Open on Sunday, then mounted a recovery as he fought back to level at 3-3 on the back of a 76 break.

World number three Allen, though, dug in again to take frames seven and eight, before missing a match-ball chance in the next and then eventually getting the job done with a 69 break.

Allen, who had beaten former world champion Mark Williams in the first round, goes on to play Ali Carter for a place in Sunday’s final.