World Championship 2013: Mark Williams beaten by Michael White

Michael White, 21, at the Crucible

Michael White caused an upset by beating fellow Welshman and two-time world champion Mark Williams 10-6 in the first round at the Crucible.

White, 21, led 5-4 going into Sunday's session and further breaks of 65, 72 and 96 saw him over the finishing line.

"It's hard to take it in but I'm over the moon," he said. "To play that well and win against Mark was unbelievable."

Meanwhile, Ricky Walden is through to the second round after a 10-1 rout of fellow Englishman Michael Holt.

Mark Davis is 6-3 ahead against four-time world champion John Higgins, while Graeme Dott leads Peter Ebdon 6-2.

Neath-born White, the world number 41, is in the Guinness Book of Records as the youngest player to make a century break, which he achieved in 2001 at the age of nine.

He also won the World Amateur Championship as a 14-year-old but was making his debut at the Crucible this year.

His match against Williams, champion in 2000 and 2003, was billed as a potential changing of the guard for Welsh snooker and so it might prove.

White made six half-century breaks against his out-of-sorts opponent and will now play either Stephen Maguire or Thailand's Dechawat Poomjaeng in the second round.

Walden, the world number 13, led 8-1 after Saturday's first session and quickly wrapped up the match to set up a second-round encounter against either Neil Robertson or Robert Milkins.

The match between Dott and Ebdon is a repeat of the 2006 final, which Dott won, and was as turgid as most people expected it to be, with only eight frames possible in the session instead of the nine scheduled because of slow play.

Ebdon, the 2002 champion, was not at his best and Scotsman Dott ground out four half-century breaks to take a four-frame lead into Monday morning's final session.

Shaun Murphy, who lifted the world title in 2005, moved into the last 16 with a 10-5 victory over Martin Gould.

Londoner Gould had won the first two frames on Saturday before Murphy fought back to lead 5-4 at the end of the first session. Fifth seed Murphy was in fine form on Sunday, making breaks of 95, 78, 106 and 95 to set up a match against either Dott or Ebdon.

In the other match, Australian Open champion Barry Hawkins won four successive frames to clinch a 10-3 success against Crucible debutant Jack Lisowski and will now play either world number one Mark Selby or Matthew Selt.