Tottenham threw away the three points after Demba Ba equalised late on from the spot after Vlad Chiriches had handled in the Europa League Group C clash with Besiktas at White Hart Lane.
The point was the least the Turkish visitors deserved after they outplayed Tottenham for large parts and but for Hugo Lloris Slaven Billic's men would have returned home with the win.
Almost from the beginning Spursfound themselves under intense Besiktas pressure. Vlad Chiriches gave possession away before catching a Demba Ba elbow that bloodied his nose.
Tottenham struggled to get any fluency into the passing, allowing the visitors to press them into errors. Upfront, Roberto Soldado was anonymous as the Spanish striker was devoid of any service.
It was against the run of play when Harry Kane picked the ball up in space thirty yards. The England U21 striker burst forward before unleashing a powerful and precise left footed shot into the bottom corner from 20 yards.
Besiktas almost equalised soon after when Olcay Sahan met a cross from the Spurs left but Hugo Lloris flung out a boot to deflect the ball wide.
The French No.1 was captain and was putting on a captain's display as he stopped Sahan again in the second half, before coming out on top in a one on one with Demba Ba after another Chiriches error.
Pochettino made changes in the second half without any noticeable change in play, apart from a nice move down the left that saw Ben Davies cut the ball back to Harry Kane, whose shot was saved well by Tolga Zengin. Besiktas kept coming, forcing several corners, and Sahan came very close with an acrobatic overhead kick that went just wide of the upright.
Chiriches had struggled with former Chelsea striker Ba all evening but he and Spurs looked to have picked up a valuable three points but, with 89 minutes on the clock, a regulation long ball over the top caused Chiriches all kinds of problems. The Romanian made a hash of his clearance, letting Sahan in beforehand handling the ball as he tried to recover. Ba made no mistake from the spot.
Manager Mauricio Pochettino was disappointed to have lost the victory so late in the game.
"In football you can always make a mistake," he said. "It was an unlucky action, a difficult action in this moment. He made one mistake after another mistake, but we need to accept it because this is football.
"I am very disappointed, I am angry, I am frustrated, but it is 1-1 in the end.
"We conceded in the last minute, which is very disappointing, and maybe frustrating. It is hard to accept this."
While Lloris and Kane impressed, few others showed enough to warrant selection ahead of the league XI who fought hard to draw 1-1 at Arsenal.