Lines' hopes ended by Allen as Trump crashes out
Allen, who knocked out Lines’ son Oliver in the previous round, always had the edge over the Yorkshireman who exited at the third round stage at the Barbican, for the second year in a row.
The Leeds potter was frustrated early on as sixth seed Allen put him under pressure from the get-go.
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Hide AdA 57 break in the opening frame helped the Northern Irish cueman into a 3-0 break at the interval.
But Lines found a way back into the match as he edged out Allen in another tight frame to reduce the deficit.
Lines was now growing into the contest and a fine break of 80 in the fifth brought the experienced potter back to within a frame.
If Allen was rattled he certainly wasn’t showing it as he clinched the next two frames without Lines barely getting a look in edgeways.
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Hide AdHowever Lines again came back, with breaks of 62 and 68 again reducing the deficit to one before Allen showed his composure with a century break of 119 to wrap up the match.
Judd Trump became the latest big name to be dumped out when he was stunned by Graeme Dott. Trump looked to be in cruise control with Dott only picking up eight points in the opening two frames.
But the Scot, who has never made it beyond the semi-finals at this tournament, fired back with six consecutive frames to dump the third seed out of the competition.
Trump’s loss means the top three seeds have all exited the competition after defending champion Mark Selby and the second seed Ding Junhui also suffered shock defeats.
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Hide AdElsewhere, Ryan Day produced a stunning comeback from 4-1 down to beat fellow Welshman Mark Williams 6-5 in an 11-frame thriller.
The two-time champion produced a century break to take a commanding lead but Day rattled off three half-century breaks as the tie went to a deciding frame.
Watch Live coverage of the UK Championship on Eurosport and Eurosport Player with Colin Murray and analysis from Jimmy White and Neal Foulds