Antrim man Mark Allen is on the brink of a first-round exit at the World Snooker Championship.
The only Irish man in this year's competition proper but the world no 6 is losing 7-2 to China's Zhou Yuelong, ranked 29 places below him.
Elsewhere in the evening session, Stuart Bingham survived a superb comeback from fellow former Crucible champion Graeme Dott to win 10-9.
Bingham, the 2015 champion, started the session 8-1 ahead but was forced into a tense decider by the 2006 winner before he prevailed.
Judd Trump has it all to do to make up a 3-6 deficit on Thai cuer Thepchaiya Un-Nooh.
World no 1 and favourite Ronnie O'Sullivan crashed out against qualifier James Cahill on Tuesday morning.