Barry Hawkins remains on course to reach the semi-finals of the World Championship for a fifth time after building up an 11-5 lead over Ding Junhui.
Hawkins won six of the eight frames on Tuesday to take control of the quarter-final encounter.
The world number six was beaten 18-12 by Ronnie O'Sullivan in the 2013 final and has reached three more semi-finals at Sheffield since.
Meanwhile, Kyren Wilson is on the verge of reaching his first Crucible semi-final as he holds an 11-5 advantage over Mark Allen.
The world number nine only needs to win two more frames on Wednesday against a man who defeated him in the Masters final in January.
The quarter-final encounter had been tied at 4-4 until Wilson took control by winning three frames in a row, compiling breaks of 105 and 90 along the way.
Northern Irishman Allen made it 7-5 thanks to a break of 78 and should also have won the 13th frame, only for Wilson to hit back from 53-41 behind to take it.
Wilson edged the next frame before making a break of 92 in the 15th as he surged 11-4 ahead.
Wilson is 1212/1 to win the World Championship, while Hawkins can be backed at 9/2, Judd Trump at 1212/1 and John Higgins at 8/13.
View all Snooker betting