Tottenham threw away a two-goal lead as last season's Champions League finalists were forced to settle for a point against Olympiakos in Greece.
Two goals in four first-half minutes put Spurs in control, with Harry Kane opening the scoring from the penalty spot before Lucas Moura's scorching 20-yard finish.
Yet Mauricio Pochettino's side conceded shortly before half-time through impressive Portuguese winger Daniel Podence's quality finish.
That lifted the passionate home crowd and Olympiakos equalised from the game's second penalty, former France forward Mathieu Valbuena beating Hugo Lloris, the current Les Bleus captain, from the spot.
The result means both of last season's Champions League finalists have failed to win their opening group games, after holders Liverpool were beaten 2-0 by Napoli in Italy on Tuesday.