Mark Allen believes there is plenty of room for improvement in his game even after he had beaten Peter Lines at the UK Championship.
The Northern Irishman, who was the runner-up in York in 2011, clinched a 6-4 win to set up a match with Joe Perry, who enjoyed a 6-3 victory over Kurt Maflin.
"I'm very happy with that win although I maybe didn't play my best," said Allen afterwards.
"I competed well and played well in the safety department but every time I came to the table the balls were a bit awkward, it wasn't free-flowing snooker.
"I feel like I've been working on the right things and it's starting to reflect not so much on my results but certainly on my performances. It's been one of my better seasons for scoring heavily but it's the other aspects of the game that I'm more pleased with."
Elsewhere on Monday, Neil Robertson was surprisingly beaten 6-5 by Mark Joyce, which means the Australian will miss the Masters for the first time since 2006. Joyce will play Lyu Haotian in the last 16.
Scott Donaldson, who knocked Mark Selby out in the second round, suffered a heavy 6-1 defeat to China's Li Hang, while the world number two Judd Trump was beaten 6-2 by Graeme Dott.
Allen is 1212/1 to win the UK Championship, while Joyce can be backed at 1212/1 and Dott at 1212/1.
View all Snooker betting