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Second-half goals from Amadou Onana and Morgan Rogers denied Graham Potter a victory in his first game as the visitors' manager.
A day after Potter was unveiled as Julen Lopetegui's replacement, Lucas Paqueta got West Ham on the scoresheet in the ninth minute when Crysensio Summerville played a square ball across the box that the Brazilian slotted into the net.
But Villa grew into the game and Onana equalised in the 71st from a corner, with Lukasz Fabianski saving Ian Maatsen's shot before the midfielder hammered home. Rogers got the winner five minutes later, slotting Ollie Watkins' pass into the corner.
In the night's other tie, League One (third-tier) Wycombe progressed with a 2-0 home win over Championship side Portsmouth with first-half goals from Brandon Hanlan and Sonny Bradley.
