Substitute Salomon Kalou headed home 10 minutes from the end of a pulsating clash to preserve Chelsea's long unbeaten home league record and earn a 1-1 draw against Manchester United at Stamford Bridge.
Park Ji-sung had put the visitors in front during an impressive spell for United before half-time.
But Chelsea dominated after the interval and after Nicolas Anelka had wasted a glorious chance, Kalou earned a share of the spoils for Luiz Felipe Scolari's men.