West Ham have stunned Tottenham at their new stadium winning 1-0 on Saturday.
West Ham won thanks to Michail Antonio's superb second-half strike.
Third-placed Spurs had won all four games since moving into the Tottenham Hotspur Stadium in early April.
But Antonio's goal in the 67th minute was the first Tottenham had conceded at home in that period, and means they are not yet certain of finishing in the top four in the Premier League.
The win ended a run of four games without victory for West Ham, who remain 11th in the table with two games to play this season.