Antrim's Allen shocked by Burns in Wales as O'Sullivan crashes out
Northern Ireland's Mark Allen lost 4-2 to World No 69 player Ian Burns at the last-32 stage of the Welsh Open at the Motorpoint Arena, Cardiff.
Antrim man Allen trailed 3-0 but hauled himself back into contention by winning the next two frames, before Englishman Burns took the next to seal victory.
World No 6 Allen had beaten Mark Joyce 4-2 in round one and China's Mei Xi Wen 4-1 in the second round.
Allen was at the centre of controversy last week when he conceded the final frame of his last-16 match against Ali Carter at the World Grand Prix despite there being 11 reds left on the table.
The Northern Irishman described the playing conditions at the Cheltenham venue as "disgusting", adding that he would have smashed his cue had he continued the match.
Alexander Ursenbacher produced an enormous upset as he beat Ronnie O'Sullivan 4-2 in a scrappy match.
And Thailand's World number 29 Noppon Saengkham compiled a brilliant 147 maximum break in his last-32 match with World number one Mark Selby to level up the match at 1-1.
It was not enough, however, to halt Selby's charge into the last 15 with the Leicester player making 107, 54 and 115 to progress.