West Ham stunned Arsenal to record a third successive Premier League victory, denting the Gunners' title challenge in the process.
2023/2024 Premier League
0-2
It was a ruthless display by West Ham, who converted two of their three shots on target, while Arsenal squandered a host of opportunities as they missed the chance to move top of the league.
Tomas Soucek fired in Jarrod Bowen's cutback and, while the ball had potentially gone out of play in the build-up, there was not enough evidence for video assistant referee to overturn the goal.
That gave West Ham a first-half lead which was doubled when former Arsenal centre-back Konstantinos Mavropanos expertly headed in a corner in the 55th minute.
Despite plenty of possession and pressure, Arsenal could not find a response.
And their woeful night was nearly made worse when Declan Rice gave away a penalty in the final minute of injury time, but Said Benrahma's effort was saved by David Raya.
The result leaves Mikel Arteta's Gunners second in the table, two points behind league leaders Liverpool, while West Ham end the year with 33 points - their highest total at the halfway stage in a Premier League campaign.
Match Events
1' Ward-Prowse's shot over the bar
2' Saka's shot too straight
10' Trossard's shot over the bar
13' GOAL! Arsenal 0-1 West Ham (Soucek)
29' Great save from Areola
41' OFF THE POST! Saka nearly scores for Arsenal!
52' Close! Rice's shot over the bar
55' GOAL! Arsenal 0-2 West Ham (Mavropanos)
64' Jesus' header too straight
65' CHANCE! Jesus' header over the bar
72' Yellow Card! Nelson booked
77' Saka's shot too straight
Line-ups
Arsenal XI: Trossard, Zinchenko, David Raya, Martin Ødegaard, Jesus, Rice, Gabriel, Ben White, Martinelli, William Saliba, Saka
Subs: Cedric, M.Elneny, Jorginho, Nelson, Ramsdale, Smith Rowe, Nketiah, Jakub Kiwior, Ethan Nwaneri
West Ham XI: Ogbonna, Areola, Vladimir Coufal, Emerson, Ward-Prowse, Soucek, Bowen, Mavropanos, Paqueta, Alvarez, Mohammed Kudus
Subs: Fabianski, Cresswell, Ings, Cornet, Kehrer, Saïd Benrahma, Fornals, Ben Johnson, Divin Mubama