Brighton win at Manchester City's Etihad Stadium for the first time
Yasin Ayari's 11th-minute goal settled it, and Bart Verbruggen made seven saves to protect the lead.
Fabian Hurzeler's Brighton beat Manchester City 1-0 on Saturday, their first win at the Etihad, and went into Sunday's games third in the Premier League.
Yasin Ayari scored the only goal after 11 minutes. City pushed hard after the break, when Iliman Ndiaye hit the crossbar, but Bart Verbruggen made seven saves in the Brighton goal.
Brighton have now won five of their last six league games, keeping a clean sheet in each of those wins. They have 19 points from nine matches and the best goal difference in the division at +17.
That left City top on 21 points, level with Arsenal, who had a game in hand.
The rest of Saturday
Chelsea beat Manchester United 2-0 at home. Morgan Rogers scored early in the second half and Cole Palmer added a penalty.
Coventry beat Sunderland 3-1. Tottenham beat Crystal Palace 2-0, Brentford beat Nottingham Forest 2-0 and Bournemouth beat Leeds 2-0. Aston Villa and Fulham finished 1-1.
The weekend finishes with Liverpool against Arsenal at 4.30pm on Sunday.
