Mohammed Kudus scored his first West Ham goal as the Europa Conference League holders came from behind to beat Serbian side Backa Topola in the opening game of their Europa League group campaign.
The Hammers enjoyed one of the finest nights in their history back in June when they beat Fiorentina in Prague to win the Conference League for a first European trophy since 1965.
But they were given an early taste of the challenge facing them following their elevation to the continent's second-tier competition.
The visitors, also known as TSC, were disciplined, determined and handed the chance of a famous win by an awful error from Angelo Ogbonna that allowed Petar Stanic to rob him of possession before running on to finish past Lukasz Fabianski.