Last season's FA Cup runners-up Chelsea returned to winning ways, comfortably beating League Two Morecambe to reach the fourth round on Sunday.
England midfielder Mason Mount put a strong Blues side ahead on his 22nd birthday from 25 yards.
Germany forward Timo Werner doubled the lead from close range - his first club goal since 7 November - before Callum Hudson-Odoi hit the third.
Kai Havertz headed the fourth after meeting Cesar Azpilicueta's cross.
Morecambe's Adam Phillips almost caught Kepa Arrizabalaga out at 0-0.
Phillips fired in a low cross which looked to have embarrassed the hosts keeper before he somehow recovered to save on the line.