Australia's Neil Robertson failed to build on his superb defeat of Ronnie O'Sullivan as Barry Hawkins claimed a place in the semi-finals of the Ladbrokes World Grand Prix.
Robertson eased past five-time world champion O'Sullivan 4-1 in their second-round meeting on Thursday afternoon but was unable to replicate that form later as he lost 4-2 to Hawkins in the last eight.
Hawkins, who beat Judd Trump 4-1 earlier in the day in Preston, did not trail against the Australian after taking the first frame with a break of 81 following a Robertson mistake.
Robertson levelled but Hawkins took the next two in scrappy circumstances.
Hawkins missed a chance to settle the match in the fifth frame, and Robertson replied with a frame-winning run of 51, but he made no mistake in the sixth, securing victory with an 85 break.
Robertson's performance contrasted with his effort in the afternoon, when he built a 3-0 lead against O'Sullivan and threatened a whitewash.
O'Sullivan eventually came from behind to win a tight fourth frame but Robertson went through after a break of 83 in the fifth.
"It was probably one of the better results I have had against him," Robertson said.
"There probably wasn't a lot he could have done.
"My safety was fantastic and long potting was good. I scored very heavily from good positions too. It was very pleasing all round."
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