Arsenal win set-piece battle to sink Chelsea in title boost
Mikel Arteta's side struck twice from corners and also conceded from the same route in a match that underlined the increasing importance of set-pieces in the Premier League.
William Saliba's first goal since December 2024 put Arsenal ahead in the first half at the Emirates Stadium.
Piero Hincapie's own goal drew Chelsea level from one of Reece James' deadly corners just before the break.
But Timber won a priceless three points for Arsenal with his second-half header before Chelsea winger Pedro Neto was sent off for a second booking.