Crystal Palace shocked by the top of the Premier League table by beating Chelsea 1-0, their first win over the Blues since 1990.
Palace scored on a John Terry own goal.
It was the Blues' second straight away loss following their defeat at Aston Villa.
Julian Speroni twice denied Eden Hazard, the second a stunning save when Hazard was through one-on-one.
The loss was José Mourinho's first against promoted side during his time with Chelsea, Inter Milan or Real Madrid.