Judd Trump is celebrating the biggest win of his career after beating Ronnie O'Sullivan in the Royal London Watches Grand Prix in Glasgow yesterday.

The 19-year-old Keynsham potter fought back from 3-2 down to stun O'Sullivan, the world champion and world No 1, 5-4 in their quarter-final clash at the Scottish Exhibition and Conference Centre.

And with victory at this year's £500,000 BBC-televised tournament, the 19-year-old guaranteed himself his biggest pay day of £20,000 for reaching the semi-finals.

If the world No 41 were to go on and win the tournament he would pocket a cool £75,000.

He will play either John Higgins, the two-time world champion, or Chinese prodigy Ding Junhui in the next round.

"Ronnie's probably the best player to have ever played the game. Beating him is massive, it's bigger than beating anyone else," beamed Trump.

"It feels brilliant to have beaten him, it's the biggest win of my career by a mile. We both struggled, but I went out there to win and I got the job done.

"I had chances to win 5-3 and I didn't take them, so I was glad I got another chance to win the match. You don't really notice the TV cameras, but you feel the pressure because you're playing Ronnie.

A break of 40 saw Trump pinch the opening frame before he won the second frame on the final pink.

O'Sullivan rallied and breaks of 41, 66 and 104 saw last season's beaten Grand Prix finalist edge 3-2 ahead. Trump won a crucial sixth frame to level matters, before the match went to a decider after the next two frames were shared.

And, having wasted four good chances to win the frame, Trump finally won it after his opponent missed a risky red to a middle pocket.

"I know I've got the game to win it [the tournament], but I need to work on my break-building because I'm making 40 or 50 and then breaking down every frame," added Trump.

"I fancy beating anyone on my day, although I haven't played that well to be honest.

"If I can get my break-building going in the semi-final, then I think I can win the tournament.

"I've got a lot to prove now. Hopefully I can have a good performance in the semi-final.

"My highest break is 59 in two matches and I've still managed to beat Joe [Perry] and Ronnie.

"My safety has been quite good, that's what's got me through.

"If I can get my break-building up, then I think I'll have a good chance of winning my next match.

"It's down to one table situation now, so it will be completely different again for me."

Looking back on the match, Trump who had match breaks of 40, 51 and 47, continued: "I went 2-0 up and I had chances in the next two frames. I thought when it went 2-2 I wasn't going to get a chance, I thought he won it 5-2.

"When he missed at 3-2 I knew had to win that frame, otherwise it was all over. Luckily I won that frame and put a bit of pressure on him.

"I just need to step up my break-building because it's letting me down. If I want to be winning the tournament I want to be making centuries at one visit.

"I've been working on my safety, I've been learning from players like Steve Davis. The older players are the best safety players.

"For Steve Davis to be getting where he is at 51, it's brilliant. You can a lot from people like Steve."

O'Sullivan has moaned about his form all week, but praised his opponent for his deserved victory.

"I've not seen a lot of him, but he's obviously dangerous," said the Chigwell cueman.

"He's a very good potter, but they're all great potters these days, there's a lot of dangerous opponents.

"He's young and he's hungry for success, but I don't what to say he's great because he's only young, he's not bee on the snooker scene that long.

"You've got to give him another five, six or seven years before you start judging how good he is.

"It's only one performance at the end of the day, he needs to kick on and win the tournament for this win to really matter."

On his own performance, O'Sullivan added: "I can't pot a ball over six foot at the moment, I have to really struggle. I'm awful, but it still doesn't stop me trying.

"I feel more confident potting balls left-handed than I do right-handed at the moment."