Chelsea were held at Stamford Bridge by west London rivals Fulham to put another dent in their title hopes.
After victory over Manchester City a fortnight ago, Andre Villas-Boas' side have now drawn three games in a row to fall off the pace at the top of the Barclays Premier League.
The Blues dominated proceedings throughout, but were unable to break the deadlock in a frustrating first-half.
However, Juan Mata gave them a deserved lead two minutes after the interval, with the Spaniard's first-time strike from the edge of the box flying past keeper David Stockdale.
The lead lasted less than ten minutes though, with Costa Rican international Bryan Ruiz skipping past Ashley Cole and finding Clint Dempsey, who finished from close range.
Martin Jol's side were able to hang on for the point thanks to Stockdale's heroics, who saved superbly from Fernando Torres in the first-half and again from Daniel Sturridge in the second period with the score at 1-1.
Didier Drogba, Raul Meireles and Florent Malouda were also thwarted by the young English keeper in the later stages, and the Cottagers now move up to 13th in the table.