Jarrod Bowen and James Ward-Prowse struck after half-time to help West Ham turn the tables on Tottenham with an impressive second-half display to earn a memorable 2-1 win at their rivals.
Cristian Romero put Spurs ahead in the 11th-minute and had Ange Postecoglou's side on course for a first victory since October 27 at the break. David Moyes' men had other ideas and after Bowen scored for the seventh away Premier League game in a row, Ward-Prowse capitalised on an error at the back with 16 minutes left.
It consigned injury-hit Tottenham to a fourth defeat in five matches, while ninth-placed West Ham are now only three points behind the hosts following this fifth win in six games.