MARK Selby says he felt ‘all over the place’ in his shock Welsh Open quarter-final defeat at the hands of Jordan Brown as he rued one of his worst displays of the season.

The Jester went down 5-4 against the world No.81 after losing the deciding frame of an epic tussle which lasted more than four-and-a-half hours and went down to the final black.

Following an agonising spell of safety, Selby had a gilt-edged chance to seal his spot in the last four but hit the jaws, leaving Brown to do the necessary and book his maiden appearance in a ranking event semi-final.

“I was rubbish all the way through – it would have been a get out of jail free card if I’d won,” Selby said.

“I was all over the place from start to finish. I was pleased with my battling qualities but it was a poor show.

“I can accept losing but I’m more frustrated with the way I played. That was probably one of my worst performances of the year.”

Selby was 3-1 down at the mid-session interval but hit back to level matters, claiming the fifth frame on a re-spotted black after the scores had ended level.

The match continued in a nip-and-tuck fashion and the three-time world champion used all his trademark safety skills to achieve the two snookers he needed when behind in the final frame.

But the miss on the black left the door ajar for Brown and the Antrim Ferrari did the necessary to set up a meeting with Stephen Maguire in the last four.

A delighted Brown said: "I'm over the moon. Years of hard work have paid off for this moment and it's not over yet."

“To finally prove myself against one of the top players is a dream come true.

“He (Selby) is as hard as nails. When he needed snookers in the decider, I knew it was far from over. He’s the worst person to be up against in that situation.

“I was aware of his reputation but I had to concentrate on myself and I feel like I handled myself well.

“It looked an easy shot to win it – but it certainly didn’t feel like it.”

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