O'Sullivan has put his recent good form down to going running

The two-time world champion won 5-3 against Trump, who who has won English junior titles in several age groups.

World number six Peter Ebdon crashed out after he was hammered 5-1 by Joe Perry and Ken Doherty came from 2-0 down to see off Alan McManus 5-3.

Mark Williams survived a nervy battle with Marco Fu to come through 5-4.

Williams has slumped to 33rd in the provisional world rankings and has admitted he is contemplating retirement should he be forced to qualify for events next season.

But he said: "It's a massive result for me. I knew how important it was for the rankings beforehand. Now hopefully I'll go on a run here and get travelling back in the right direction.

"I'm really pleased to beat someone like Marco. He won the Grand Prix in October so to get past him is a real boost."

O'Sullivan, meanwhile, said that although he was impressed by what he saw in Trump, he was keen to keep the youngster's feet on the ground.

"Ultimately it's all about how many tournaments you win at the end of your career," said O'Sullivan.

"He's got a great talent but we'll have to see how he develops in the future."

The only blip in an impressive display by O'Sullivan came in frame seven when, having potted six reds and blacks, playing left-handed he squandered a chance of a maximum break.

O'Sullivan shares the record of eight competitive 147 breaks with Stephen Hendry, and admitted it was frustrating to have wasted the chance of claiming a ninth.

"I was just stretching a little bit and off balance. Basically I messed up," he said.

His next opponent will be Steve Davis, who he beat in the final of this tournament four years ago, coming from 8-5 down to win 9-8.

Davis secured his place in the last 16 on Tuesday when he beat Mark King.

Stephen Lee, who lost the Wembley final to Mark Selby, earned his place in the last 16 with a 5-3 win Andrew Higginson.

And Hendry kept alive his chances of a first trophy since 2005 after overcoming Michael Holt 5-1.

The Scot had a sticky start, pinching the first frame on the black having required two snookers with one red still on the table, but then breaks of 75, 82 and 47 helped him to an easy win.