Barry Hawkins moved to the brink of the Betfred World Championship semi-finals as he took an 11-5 lead over Ding Junhui.
Hawkins, who has reached the semi-finals in three of past four years, continued his form in the evening session as three half-century breaks saw him increase his advantage from 5-3 to 8-3.
Ding, though, scored the first century of match with 102 and a break of 52 got the Chinese cueman back within three frames.
But Hawkins regrouped and scored his eighth break of at least 50 of the match, before a 113 clearance saw him in complete control.
Kyren Wilson is also in a strong position as he leads Mark Allen 11-5.
The 26-year-old had breaks of 125, 105 and three in the nineties to move to within two frames of victory.
How are you cueing, @TheHawk147?
— World Snooker (@WorldSnooker1) May 1, 2018
This beauty helped him to 10-5! 👌 #ilovesnooker pic.twitter.com/DFhRbLvV0J
The remaining quarter-finals were equally tight, with Judd Trump taking a 5-3 lead over John Higgins and Mark Williams and Ali Carter level at 4-4.
Breaks of 58, 100 and 71 helped Trump move 4-1 ahead of an off-form Higgins, who had thrashed Trump's good friend Jack Lisowski 13-1 in the previous round.
Higgins finally found some rhythm with a break of 74 to make it 4-2 and won a scrappy seventh frame as well, but 77 from Trump in the final frame of the session gave the left-hander a deserved advantage.
Williams started in brilliant fashion with a total clearance of 135 and a break of 60 in the second frame, but failed to get over the line and saw Carter steal it with a superb 63.
Carter, who had finally gotten the better of Ronnie O'Sullivan in a tetchy round two encounter, moved ahead with a brilliant 126 and led 4-3 after an 82 clearance, but Williams took the final frame of the session to leave the contest finely poised.
What WILL the @Betfred World Championship produce next?
— World Snooker (@WorldSnooker1) May 1, 2018
We're back tomorrow at 10am ⏰ See latest scores 👇#ilovesnooker pic.twitter.com/2z7fTXuGQ1
