Arsenal reclaimed fourth spot in the Premier League with an important victory at West Ham and dented the Hammers' own chances of securing European football next season.
The Gunners knew only a win would lift them back into the Champions League places after Tottenham beat Leicester earlier in the afternoon, but Mikel Arteta's side responded by grinding out a vital three points at London Stadium.
It was Arteta's centre-backs who came up with the goods, with Gabriel Magalhaes nodding the winner early in the second half after Rob Holding had opened the scoring from Bukayo Saka's 38th-minute corner.