Top-ranked Australian Neil Robertson was 6-2 down after the first session of his snooker world championship quarter-final on Tuesday against Judd Trump in northern England.
World No.1 Robertson won the first frame, but Trump – a beaten finalist in 2011 – rattled off the next five in succession to inch towards a place in the semi-finals.
Mark Selby moved to the brink of the semis after opening up a 12-4 lead over Alan McManus at the Crucible in Sheffield.
Leading 4-3 from the morning session of the last-eight tie, Selby won eight of the afternoon’s nine frames to close to within one frame of a berth in the last four.
The 30-year-old, a runner-up in 2007, took control from the start of the session, with a break of 86 giving him the first frame before a missed brown from Scottish veteran McManus enabled him to go 6-3 up.
McManus finally was able to get on the board when he made it 8-4, preventing Selby sealing victory with a session to spare, but back-to-back breaks of 109 and 74 in frames 14 and 15 helped leave the Leicester cueman firmly in control.
Barry Hawkins, the world No.4, was also closing in on a second successive semi-final appearance after going 11-5 up in his last-eight encounter with Dominic Dale.
Defending champion Ronnie O’Sullivan brought up his fifth century break of the competition as he overcame the loss of the first two frames to go 6-2 up against Shaun Murphy.
Murphy produced a century break to claim the first frame and also took the second before O’Sullivan roared back, overcoming some erratic cuing to move 3-2 ahead.
The five-time champion then began to turn on the style, closing out the session with breaks of 94 and 136.