Neil Robertson, Stephen Lee and Shaun Murphy also went through, as did Ireland's Ken Doherty.
Australian Neil Robertson earned a 7-2 lead over veteran Nigel Bond .
Australia's Neil Robertson beat Ireland's Fergal O'Brien 5-2, world number five John Higgins beat Tom Ford 5-4 and Joe Perry beat Matthew Stevens 5-1.
Dott now faces fellow Scot John Higgins, who eased past Australia's Neil Robertson, the player who beat him at the Welsh Open in January.
BBC: Dott thrashed Ronnie O'Sullivan 5-0 in the previous round
Also on Friday, Neil Robertson and Ken Doherty will lock horns for a place in the semi-finals after Australian Robertson beat Ulsterman Joe Swail 4-2.
Meanwhile defending champion Neil Robertson has qualified for the last 16.
BBC: SPORT | Other sport... | Snooker | Higgins given tough test by Roe
Neil Robertson, the chief executive of Trada, a Boulder, Colo.
Earlier, defending champion Neil Robertson crashed out after a 4-2 defeat in his final group match against Stephen Lee, Joe Perry beat Joe Swail 4-2 to finish runner-up in their group.
Neil Robertson, a tech entrepreneur who blogs and runs a paid-search marketplace firm called Trada, just came up with this term I love called halfnimity, or that middle zone online between anonymity and real identity.
The winning team was made up of Chris Jardine, David Owen, Thomas Sloan, Chalmers Porteous, Graham Black, Graham Sloan, Neil Henderson, Ruaraidh Whyte, Scott Robertson, and Stuart Henderson.
United composed themselves and Paul Dixon's whipped cross found David Robertson, whose downward header was claimed by Rangers goalkeeper Neil Alexander.
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