Cheikhou Kouyate scored twice as West Ham marked the first match at their new home by beating NK Domzale to reach the Europa League play-off round.
Trailing 2-1 from the first leg, the Hammers levelled on aggregate when Kouyate scored the first goal at the former Olympic Stadium, now the London Stadium, in front of a 53,914 crowd.
Kouyate put West Ham 3-2 ahead in the tie after Andy Carroll's knock down and Sofiane Feghouli added the third.
