Defending champion Ronnie O'Sullivan took a dominant 7-1 lead over Stuart Bingham in the quarterfinals of the World Snooker Championship here on Tuesday.

O'Sullivan proved far too strong for a player who has won three titles and reached two other ranking finals this season.

The 37-year-old O'Sullivan needs six more frames on Wednesday for a place in the semifinals against Shaun Murphy or Judd Trump.