Kyle Walker marked his 100th Premier League appearance for Manchester City with a goal against his former club as Pep Guardiola's side beat Sheffield United.
The right-back, who came through the ranks at the Blades, struck midway through the first half with a superb long-range strike.
It was a deserved goal for a Manchester City side who dominated the first half, and they could have added another but for an excellent save by Aaron Ramsdale from Ferran Torres' header.
Ramsdale did well again in the second half when he dived at full stretch to keep out a Riyad Mahrez free-kick.