Arsenal beat League One AFC Wimbledon to reach the fourth round of the Carabao Cup and make it three wins in a row in all competitions.
Alexandre Lacazette was making his first start since April and scored a penalty after Nesta Guinness-Walker fouled Gabriel Martinelli.
Emile Smith Rowe converted from Lacazette's pass and Eddie Nketiah's lovely flicked backheel from Cedric Soares' cross sealed the win.
The Gunners should have beaten the Dons by more after hitting the woodwork twice.
Visiting goalkeeper Nik Tzanev tipped the ball onto his own bar in the first half, and Nuno Tavares later headed off the post.