double bagel
n.— «Two-time defending champion Roger Federer warmed up for his third consecutive Tennis Masters Cup final with a 6-0, 6-0 rout of Gaston Gaudio.…Gaudio, seeded seventh, said he’d never lost by such a score. A “double bagel” as it’s called in tennis parlance is rare.» —“Federer Routs Gaudio, Gains Masters Final” by John Pye in Shanghai, China ABC News (U.S.) Nov. 19, 2005. (source: Double-Tongued Dictionary)