Arsenal boss Mikel Arteta says his side have to get better at game management following a hectic first half against West Ham on Saturday.
The Gunners ran riot over their London rivals at the London Stadium, winning 5-2 to bring them within six points of Premier League leaders Liverpool.
Gabriel Magalhaes gave the visitors an early after heading in from a corner. Leandro Trossard doubled their lead before Martin Ødegaard converted from the penalty spot. Kai Havertz scored on the counter to put them four up after just 33 minutes.
Aaron Wan-Bissaka got one back for West Ham soon after, though, and Emerson found the net just moments later to reduce the deficit to two goals. The game was put out of reach, however, when Bukayo Saka scored a penalty deep into first-half stoppage time.