|Dates: 11-18 January Venue: Alexandra Palace Coverage: Live on BBC TV and online|
Stephen Maguire and Neil Robertson reached the Masters quarter-finals, both with 6-4 wins at Alexandra Palace.
Judd Trump, among the favourites after reaching last month's UK Championship final, capitulated against Maguire having won the first two frames.
World number one Robertson was made to work hard against Robert Milkins, after losing the opening frame.
Australian Robertson, who last won the Masters title in 2012, recorded three successive frames to seal victory.
In the earlier game, 25-year-old Trump, from Bristol, watched Maguire win four consecutive frames which included a break of 96.
World number seven Trump levelled, but let the Scot, 33, back in. The match turned in the third frame with Maguire just avoiding going 3-0 down.
After fighting back to go 5-4 ahead, Maguire was gifted the chance for victory - which he took with a run of 64 - in the 10th frame when Trump missed a simple black off the spot as he focused on shattering the pack of reds to all corners.
"How I was 2-2 at the interval, I'll never know," Maguire told BBC Sport, as he looked forward to meeting Shaun Murphy, conqueror of world champion Mark Selby, in the last eight.
"I think it will be a good match against Murphy. We've had some right good games in the past."