Champions Manchester City stayed in touch at the top when they came from behind to beat Swansea.
This was the largest profit made since Roman Abramovich took over the club 11 years ago.
A 2-0 defeat in the fixture last season inflicted a massive blow to their bid to win the English league title.
Chelsea is four points clear at the top of the Premier League.
In other results, Chelsea thumped the Shrews and WBA were knocked out by Bournemouth.
Chelsea went four points clear at the top of the EPL after a 1-1 draw against Man United.