Timo Werner and Ben Chilwell scored late on to give Chelsea all three points against 10-man Southampton and send the Blues to the top of the Premier League.
The hosts entered this match expecting a response after two damaging defeats to Manchester City and Juventus, but looked set to be held to a 1-1 draw after James Ward-Prowse scored from the spot.
However, Werner netted with just four minutes remaining after Ward-Prowse was sent off with Thomas Tuchel’s team returning to winning ways after a challenging week.
It took Chelsea just eight minutes to open the scoring with Trevoh Chabolah headed home at the back post after a flick-on by Ruben Loftus-Cheek from a Chilwell corner kick.
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Chelsea looked to have doubled their advantage when Romelu Lukaku slid a finish across goal and into the far corner, but the flag was raised against the Belgian.
Werner also had a goal chalked before the break for a foul in the build-up.
However, Southampton pegged back the home side after Chilwell hacked down Tino Livramento inside the area. This presented Ward-Prowse with the chance to convert from 12 yards.
Southampton were reduced to 10 men on 77 minutes when VAR was used to spot a dangerous tackle by Ward-Prowse on Jorginho and Chelsea used their man advantage to crank up the pressure with Cesar Azpilicueta assisting Werner four minutes from the end.
Chilwell made sure of the points with a shot that crossed the line after Lukaku and Mount had both struck the woodwork as Chelsea put the finishing touches on the result.
Source: Eurosport