Chelsea must wait to secure a Champions League return as Tottenham kept their hopes of a top-four finish alive by twice coming from behind to draw 2-2 in their Barclays Premier League clash.
In a pulsating contest with plenty at stake, Europa League finalists Chelsea deserved their half-time lead courtesy of goals from Oscar and Ramires, either side of an exquisite Emmanuel Adebayor shot.
Tottenham had not won at Stamford Bridge in 23 years but levelled in the 80th minute through substitute Gylfi Sigurdsson to deny Chelsea a seventh successive Premier League home win.
The Blues are now third by two points ahead of Saturday's penultimate match of the campaign at Aston Villa, while Spurs sit one point behind Arsenal, with an inferior goal difference.
Chelsea were on top during a frantic opening and took the lead after Tom Huddlestone made an off the ball block on Eden Hazard, who was lively on his return from a calf injury.
Juan Mata's free-kick went out for a corner and the Spaniard's inswinging cross found Gary Cahill, whose header was going wide of the target until an unmarked Oscar turned it in.
Out of nothing, Spurs levelled as Scott Parker won the ball on the edge of his area and it broke for Adebayor. The Togo striker ambled forward unopposed as Chelsea's defence appeared preoccupied by Gareth Bale peeling away on the right and Adebayor, with time and space as Cahill backed off, unleashed a delicious curling shot into the top corner.
Bale and Adebayor had half chances and Ramires shot over before restoring the lead. Fernando Torres, back in the starting XI and without his protective face mask, cut in from the right wing, breezed by Huddlestone and fed a ball past Jan Vertonghen and Dawson to the rampaging Ramires, who tucked in.
Kyle Walker and Oscar exchanged shots before the interval and Torres was unable to cleanly connect with crosses from David Luiz and Hazard early in the second period as his wait for a first Premier League goal of 2013 continued.
Hazard was replaced by Victor Moses 17 minutes from time and immediately went down the tunnel for treatment, hoping his night's work had been enough. But seven minutes later Spurs were level. A loose Luiz pass was picked up by Huddlestone, who fed Benoit Assou-Ekotto and the left-back found Adebayor in the area. Adebayor flicked the ball to Sigurdsson, who found the bottom corner.