O'Sullivan in control
Defending champion Ronnie O'Sullivan recorded his fifth century-break of the tournament as he fought back from a poor start against Shaun Murphy in the quarter-finals of the Dafabet World Snooker Championship.
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The 38-year-old, who knocked out Joe Perry 13-11 in the last 16 at the weekend, fell two frames down to the world number eight - winner here in 2005 - at the Crucible.
But, after turning things around in the third frame, the Rocket never looked back and claimed an impressive 136 break during the eighth to establish a comfortable 6-2 lead.
Murphy got off to an ideal start as he recorded a century to take the first frame and then clinched the second before the five-times winner fought back in the third.
Both players were having problems as O'Sullivan failed to pot a red to the middle pocket and then followed the green in. He missed the brown moments later and it looked like things would not go his way before he eventually started to turn things around and finished off on the black to trail 2-1.
The Essex potter never looked back and took the lead for the first time in the match to go 3-2 up much to the pleasure of the Crucible crowd.
In the sixth frame, Murphy made a mistake as he left the black over the middle pocket and his opponent potted the pink and closed out the frame.
O'Sullivan then hit a quick-fire 94 to increase his advantage before eventually recording a break of 136 to finish the session.
World number one Neil Robertson, who won here in 2010, trails 6-2 after his opening session against Judd Trump.
The Australian took the first frame before losing the next five to his English opponent, who made it look easy as he recorded a century in the fifth frame.
Earlier on, Mark Selby held on to take a 4-3 lead following the first session against Alan McManus.
The 30-year-old from Leicester, who won a battle of former Crucible beaten finalists as he saw off a fightback from Ali Carter to record a 13-9 victory in the last 16, impressed with a century break during the sixth frame to level the match for the second time before claiming the final frame of the session.
McManus earlier fought his way back from two frames down and took the lead with victory in the fifth before Selby won the next two to reclaim his advantage ahead of Tuesday evening.
McManus, who survived a comeback to see off fellow veteran Ken Doherty 13-8 in the last 16, lost the first frame before forcing a difficult end to the second where - after a lengthy safety exchange - Selby finally potted the pink to take a 2-0 lead.
But the 43-year-old Scot, once again wearing his tartan trousers at the Crucible, managed to break back into the match with victory in the next two frames to level at 2-2 before claiming the next one to take control for the first time.
Selby, though, hit back with a 110 break and took the sixth frame and then edged 4-3 ahead following the seventh before the players were taken off the table one frame early.
Barry Hawkins raced to a 4-1 advantage over Dominic Dale in their last-eight clash, eventually taking a comfortable 6-2 lead into the evening action.
Hawkins, who managed to hold off Ricky Walden 13-11 to progress on Saturday, looked like there was no stopping him as he took the first two frames before Dale pulled one back.
The world number four continued to battle on and will be pleased to start the next session with a dominant lead after finishing with an impressive 134 break.