Arsenal go second after wild West Ham shoot-out

The London sides shared seven first-half goals 

Arsenal's Martin Odegaard (left) celebrates after scoring his side's third goal.

West Ham 2 (Wan-Bissaka 38’, Palmieri 40‘) 

Arsenal 5 (Magalhaes 10‘, Trossard 27‘, Odegaard 34‘ (p), Havertz 36’, Saka 45+5’ (p))