Chelsea have restored their 10 point lead at the top of the Premier League table with a win over London rivals West Ham on Monday night.
A much-changed Blues XI which saw Cesc Fabregas start ahead of Nemanja Matic were knocked out of the EFL Cup at the same ground in October.
Chelsea grabbed the opener when N'Golo Kante broke up an attacking move on the left, fed Hazard who played a one-two during a swift counter-attack and dribbled past Randolph in goal.
Chelsea's second came when Diego Costa kneed in a flick from a Cesc Fabergas corner kick.
The goal was Costa's 18th goal of the season and his 17th in the Premier League.
Manuel Lanzini grabbed a late consolation for the Hammers, who remain just outside the top-10, as he rifled home his sixth league goal of the season.
The win see's Chelsea led the log by 10 points with 27 games of the season already played. the Blues face Manchester United next week monday for an FA Cup tie.