Ronnie O'Sullivan was warned for swearing, Steve Davis became the oldest quarter-finalist in a world-ranking event for 14 years and Jamie Cope made a 147 break and lost as the Shanghai Masters field was reduced to the last eight.

O'Sullivan was warned by the referee, Brendon Moore, in beating Joe Perry 5-3. Davis, who at 51 is nine months younger than Doug Mountjoy was as a 1994 British Open quarter-finalist, recovered from 4-1 down to beat Dave Harold 5-4, and Cope became only the 15th player to make a maximum in a losing cause as he went out 5-2 to Mark Williams.

Ricky Walden came from 4-1 down to beat Australia's Neil Robertson 5-4 and will meet Davis today.