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Thanks for joining me for this match...make sure you come back tomorrow to see Ronnie take on seven-time champ Hendry in what should be a cracker...
13-7
...FANTASTIC CLEARANCE OF 79! Frame-and-match winning clearance moves O'Sullivan into a semi-final against Hendry!
12-7
...Ronnie misses a red into the middle after a poor break-off shot from Liang...and the Chinese player makes him pay...the break is up to 41, all reds and blacks...BUT HE LEAVES THE BLACK OVER THE CORNER!
12-7
...When O'Sullivan over-cuts a red into the middle...Liang fires home a frame-clinching 30...12-7
12-6
...Liang rolls home a delicate pink into the middle to keep the break going...the crowd are loving his attacking outlook...
12-6
A quick break of 54 from O'Sullivan, although he is not quite over the finishing line yet....Liang finds a plant to manufacturer, although he fails to finish on a colour...
12-6
Ronnie is on his feet after seeing Liang miss a red into the yellow cushion...only to see the red run along the top cushion and fluke into the opposite corner...Liang immediately goes into the pack as he sets off on another attacking break...
12-6
...unfortunately for Liang, he pots the brown but misses the blue with the rest...and leaves it over the middle pocket for Ronnie to clear up and nick the frame...
11-6
...O'Sullivan moves into a five-point lead, but two sloppy shots on yellow and green leave him out of position and he misses the brown...
11-6
O'Sullivan makes 20 before failing to free a red off the pack...he plays safe...
11-6
Liang makes a good 53 before his effort on a tough red to the corner fails...eight reds remaining, plenty of points to play for as Ronnie comes to the table...
11-6
...A superb long red into the yellow pocket when O'Sullivan thought he had got safe begins another break for Liang...he's up to 45
11-6
Liang makes 66 in his second effort after Ronnie had missed a red into the corner...the frame looks beyond the two-time champ as he comes to the table for a bit of practice...a couple of shots later and he has conceded...
11-5
Liang makes an opening 12 before missing a long blue to the green pocket...
11-5
The opening break-off has been made...can Ronnie wrap up the two frames he needs quickly, or will Liang make him sweat?
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Hello; welcome to our coverage of the final session of this quarter-final...the crowd are starting to fill up the Crucible...we'll be underway at around 7.10pm UK time...
11-5
Two breaks of 30-odd end the session with another frame to O'Sullivan's name. He is only two from victory with one session left to play - it will take a comeback of epic proportions for Liang to go through from here.
10-5
Liang given a chance as O'Sullivan misses a simple red using his rest... there are awkward reds at the bottom of the table... but he misses a long one at the top that he should put down! He has 52 points but here comes Ronnie... he cannot get going and Liang wraps it up to finally win a frame today.
10-4
Six in a row for Ronnie as he falls just short of a ton. He slaps the table as you might a jovial thigh and heads out for a few seconds, probably to have a wee. I'm just saying.
9-4
Upon their return O'Sullivan is straight on to another break, building it up towards 50 and beyond... the frame is safe... the 100-mark passes... and he ends with 138! A total clearance. Liang disappears somewhere to clear his thoughts. The Ronnie express is going full steam and potting plenty of balls along the way.
8-4
O'Sullivan blasts two half-centuries either side of a terrible miss from the cue of his Chinese opponent. He completely misjudged a pot to the bottom-right corner - the pain on his face shows what he is going through. The match is slipping away as we head into the mid-session interval.
7-4
Liang yet to find his rhythm today, needing snookers on the third frame. After the blue goes down he tries to stick the pink behind the black, but cannot - and O'Sullivan pots it long to win another.
6-4
The Essex potter moves two frames ahead after seeing that break flower into something beautiful - well, a 67.
5-4
O'Sullivan takes the lead from Liang with a 76 run and is building another decent break in the second frame of the day.
4-4
The score is tied at four apiece after the first spell. It will be an intriguing battle for the semi-finals between the Chinese hopeful and 'Rocket' Ronnie.
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Welcome to the second session of the World Championship quarter-final match between Ronnie O'Sullivan and Liang Wenbo.
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Thanks for joining me for that fast-paced, high-scoring session...make sure you stick with us for all the news from the Crucible...
4-4
Liang eventually misses...and concedes the frame...4-4 it is...very interesting session.
4-3
...Ronnie makes 70 before again missing a red along the bottom rail...but Liang comes to the table needing a snooker...we should be 4-4, unless the youngster can find something special...
4-3
A very optimistic red cut into the corner is missed by Liang, handing Ronnie a much-needed chance to get back on level terms in this final frame of the session...
4-3
...again, the mistake is fully punished...another fine frame-clinching break of 89 seals the frame...the youngster is back into the lead...
3-3
Ronnie doesn't look best-pleased in his chair at the moment as Liang pounces on a slightly loose safety to fire a long red into the corner...the youngster is 42 ahead with 51 remaining...
3-3
Liang makes 22 before being forced to play safe after an unlucky split from the pack...O'Sullivan is 20-23 down, but plays a fine safety...
3-3
...and Liang makes Ronnie pay fully for the mistake on the red, as he fires in a fine 104 up to the pink...Ronnie looks frustrated in his chair...
3-2
...Ronnie has clicked up a gear...24...all reds and blacks...stemming from a fine long red...but the break ends with a tough red along the cushion...
3-2
The rapid berak-building goes on...O'Sullivan moves into the lead for the first time in this quarter-final with a break of 71...ended when the black just stayed in the jaws...
2-2
The players are back after their break...Ronnie is immediately back amongst the balls...
2-2
O'Sullivan makes a frame-clinching clearance of 58 to ensure he goes into the mid-session interval 2-2...he looks very relaxed as he goes off for a 15 minute break...
2-1
Liang makes another attacking 26 at the start of the fourth frame...he eventually has to play safe, but it is another good contribution from the youngster...
2-1
...and Ronnie makes him pay fully with a 109...high-quality stuff from these two at the start of this match...
2-0
Huge error from the youngster in the third frame though...he goes for a very tough long red, with the white nestled right up against the top cushion...cannoning the reds all over the table...
2-0
...and 49 points later, the youngster has a 2-0 lead. Ronnie has barely had a shot as yet - and those he has been offered, he has been off-target with. Interesting start.
1-0
Liang makes another impressive 48 before running out of position...he still takes on a very tough red in to the yellow pocket...but misses. However, Ronnie goes in-off with the white in trying to capitalise, and Liang comes back to the table with a chance to seal a second frame...
1-0
...the break ends at 80, Ronnie concedes...opening frame to the young Chinese player, and no sign of a hangover following his dramatic win last night...
0-0
Liang has made a good start here...his break is up to 42...
0-0
The players are out and the introductions are complete...off we go!
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Hello...the players are about to be introduced to the feverish crowd...