Mark Allen reaches semi-finals at The Crucible with hard-fought win over Jak Jones

Mark Allen reached the semi-finals of the World Championship for just the second time in his career with a hard-fought win over qualifier Jak Jones.

The Antrim native was far from his fluent best and made just one break over 70, but took advantage of a nervy display in the final session from debutant Jones to secure a 13-10 victory.

"It was never in doubt was it?" a relieved Allen joked after reaching the last four at The Crucible for the first time since 2009.

"It was a complete slog to be honest. The first session was really good but I was awful after that and it was just a matter of digging deep, trying to stay as positive as possible and trying to get 13 frames. That's what I did."

Asked what had been the deciding factor, Allen told the BBC: "The safety (department) in the end. We both missed balls.

"I felt like as the match went on he was getting more edgy but I wasn’t playing well enough to capitalise, so it was just a matter of staying patient and taking my chances when they came.

"It wasn’t pretty, I’m sure it wasn’t pretty to watch but I couldn’t care less. I’m in the semis.

"I don’t mean this to sound bad to Jak, but that was like a three or four out of 10 performance. That really wasn’t good. But mentally I was like a 12 out of 10 and ready for anything.

"Sometimes that’s more important and that’s a match I would have lost a few years ago."

With the contest finely poised at 8-8, Jones won the opening frame on Wednesday with a break of 77 before contributions of 66 and 64 from Allen edged him back in front as Jones missed a number of simple pots.

To his credit, the Welshman composed himself quickly to draw level with a break of 124 which was a total clearance in every sense as he deliberately potted the white along with