Mark Allen put his dispute with Barry Hearn to one side as he reached the quarter-finals of the UK Championship with a comfortable 6-2 win over Ali Carter.

Allen, 25, was referred to the game's governing body yesterday following a four-letter outburst against the World Snooker chairman.

After his first-round win over Adrian Gunnell on Monday, Allen accused Hearn of reneging on promises and looking to "make money for himself", claiming the 63-year-old's attitude was one of "**** the players".

The row continued today, with Hearn telling BBC Sport he was "far too busy to worry about silly little boys making silly little comments".

Yet Allen refused to be distracted by the controversy as he breezed past a below-par Carter at York's Barbican Centre.

After Carter had failed to take advantage of an early opportunity, an assured break of 78 gave the Northern Irishman the first frame.

Carter hit back by taking a scrappy second, despite initially breaking down on frame ball, but Allen swiftly re-established his advantage with a fluent 101 in frame three.

Things were starting to look ominous for the Englishman as he played a host of loose shots to slip 3-1 down at the mid-session interval.

Carter did manage to claim the fifth frame, but a confident Allen then overturned sizeable deficits in the next two with runs of 72 and 67 respectively, and it was not long before he completed a routine victory.

Allen will face Marco Fu in the last eight after the Hong Kong cueman inflicted a shock 6-3 defeat on world number one and bookmakers' favourite Mark Selby.

A series of uncharacteristic errors from Selby allowed Fu to take the opening two frames, but the 2007 World Championship finalist looked to have got back on track as he fired in breaks of 51 and 102 to draw level.

It appeared Selby would move ahead when he put together another half-century to move 53-19 ahead in the fifth.

However, he then fired the black off the table and Fu took advantage with an accomplished clearance of 64 before restoring his two-frame lead in a scrappy sixth.

Selby pulled it back to 4-3, but Fu, runner-up to Shaun Murphy in this event three years ago, once again came from behind to take the eighth frame on the black and a composed break of 85, his highest of the match, put the seal on an impressive win.