GLASGOW snooker star Anthony McGill will today begin his bid for a place in the semi-finals of the Betfred World Championship at The Crucible in Sheffield.

The 24-year old - who has already knocked out fellow-Scot Stephen Maguire and world champion Mark Selby - meets world No.8 Shaun Murphy, the 2005 champion, who reached the quarter-finals for the eighth time by beating Joe Perry 13-5 last night.

McGill will go into the last-eight showdown fresh after having had three days' rest following his stunning win over Selby,

Meanwhile, Ronnie O'Sullivan admitted his motivations have changed when it comes to winning the title after easing into the quarters with a 13-5 victory over Matthew Stevens.

The five-time champion needed to win just one frame to book his place in the last eight where he will face Stuart Bingham, although Stevens, who was suffering from a neck injury, won the first frame of the final session before O'Sullivan powered through.

Trailing 12-4 from Sunday, Stevens cut the gap to seven frames with a 63 break before his 39-year-old opponent ended the contest in the next with a run of 77.

Following the relatively simple conclusion to the match, O'Sullivan revealed he has a much calmer approach in his bid to win a sixth world title.

"Matthew had a really bad neck and I know what it's like to play with a bad neck. He couldn't even get down on the shots so it was a bit difficult to watch your opponent suffering like that," O'Sullivan said.

"It was hard for Matt there so it was hard for me to get motivated. I know I only needed one frame so there was no adrenalin there. I just kind of had to get something and get the one frame I needed.

"I'm still happy to be in the tournament and if I can find a bit of form then I've got a chance. It's still good to be in the tournament."

When asked if he still felt the same buzz going for his sixth world title as he did for his first, O'Sullivan said: "No, not really. When you've won it five times and you've won everything else then you don't really get that excited about it.

"For me I'm just happy to still be playing but nah, I don't get excited like I used to when I was going for one, two, threes and fours. You're just kind of hungry for it.

"I've kind of settled at five. It's not a bad innings and if I can add to that, that's great, but you kind of lose motivation in the end. It's not the same kind of motivation, it's a different kind of motivation. A lot calmer, more relaxed about everything.

"There's no pressure on me to win another one but it would be nice. It's a different type of pressure I suppose."

In the other match which finished in the evening session, Neil Robertson came through 13-5 against Ali Carter to line up a last eight meeting with Barry Hawkins.

Robertson crossed the line in style with a break of 145 - the highest in the tournament so far - to claim victory after leading 11-5 overnight.

World No.6 Judd Trump is also through after completing a 13-8 win over Marco Fu with a brilliant century.

Trump, the 2011 runner-up, rattled off a complete clearance of 133 to end the resistance of Fu and book a date with Ding Junhui.

Trump said: "It was solid. There was nothing too extreme - a few dodgy sessions in the middle of the match where I could have probably closed it out - but other than that, I think I was quite solid from start to finish.

"Marco changed his game plan and went for everything towards the end, so that made it quite difficult, but I am pleased how I closed out the match."

On his overall prospects, he said: "I am very confident in my game this time. I know if I keep it up I have got a good chance, but it only takes one bad session at this level. You have got to be consistent every single day."