| Venue: Crucible Theatre, Sheffield Dates: 16 April-2 May |
| Coverage: Watch live on BBC TV and Red Button with uninterrupted coverage on BBC iPlayer, the BBC Sport website and the BBC Sport app |
Mark Williams fought back from 13-11 down to beat Judd Trump in the semi-finals of the World Championship.
The three-time champion fell 12-5 behind when Trump opened the third session with a 120 break.
Williams made four half-centuries and a 137 break to win five frames.
Williams took a tense final frame while Trump had a run of 113.
The match will end at 14:30 BST on Saturday.
The world number one took control of their last-four meeting after moving into a 10-6 lead.
The six-time champion made five half-centuries to take a 9-6 lead after the first session. A series of loose shots and failing to score heavily from several good chances were the things that made Higgins guilty of.
His misery was compounded when he missed a black off the spot and then saw O'Sullivan take the frame to a re-spotted black before winning his fifth in a row.
Having apologised on Twitter for his performance in the first session, Williams - in his seventh world semi-final - was much improved on Friday morning as he shared eight frames with Trump.
The Welshman shook his head and ruefully looked up into the crowd as he left a red over the left corner, and Trump duly potted it on the way to a sensational start.
Williams responded quickly and emphatically as he built his 14th century of the tournament and made two half-centuries in the following frame to transform the feel of the match.
Trump, who has won 23 ranking titles and has a superior head-to-head record against the Welshman, was capable of winning the match with a session to spare.
Instead of being a processional run towards victory, he was consigned to his seat for long periods as Williams rattled in a series of stunning long pots to huge roars inside the arena.
Breaks of 57 and 77 brought Williams to within two frames of Trump at 12-10), with the Englishman failing to pot a ball for more than 30 minutes.
With Williams winning the final frame of the evening, it raises the possibility of Trump completing the largest-ever Crucible semi-final comeback on Saturday.
Ken was a world champion.
What a performance. The match between Judd Trump and Mark Williams is back on.
Mark has something that makes him a great champion. He showed a lot of character and believed in his technique. Mark Williams is one of the greatest players that has ever played the game. He potted some great balls and didn't want to give it to Judd easily.
During the later parts of the first session, O'Sullivan ran through the gears with two tons and three half-centuries.
He was able to pick up where he left off, although he was aided by four-time winner Higgins.
The Scot's troubles began when he accidentally knocked a red into the bottom left corner after potting the brown to allow O'Sullivan to make a clearance of 73.
In the 10th frame, the cue ball went off the green and into the middle pocket, causing him to miss the black.
The pair traded frames to go into the mid-session interval at 6-6.
The damage was done in the final frame of the session, when O'Sullivan made runs of 61, 55, and 70 to add to an earlier 99, while Higgins missed a routine black and the damage was done.
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