Sunderland moved up to second in League One with a comfortable victory at Doncaster Rovers.
Ross Stewart's early penalty and one just before half-time from Elliot Embleton put them in control at the Eco Power Stadium.
An own-goal from Ben Blythe early in the second half completed the job as they cruised to three points.
Doncaster rarely threatened the Black Cats' goal and remain in deep trouble in 23rd in the division.
The win takes Lee Johnson's team just one point behind leaders Rotherham, who lost 1-0 at Accrington on Boxing Day.
This result was never in doubt from the moment Stewart scored his 12th of the season via the penalty spot after on-loan German Leon Dajaku had been tripped by Branden Horton.