Chelsea headed to Germany in hopes of maintaining their unbeaten streak in the Conference League, and if it was not for some phenomenal keeping, it could have been a whole different story.
Heidenheim started the game well with some clever moves and passes. The side sitting in 15th in the Bundesliga did not shy away from a Chelsea side in some form.
However, in the second half, the West Londoners came out well, and the club's top goalscorer, Christopher Nkunku, would open the scoring.
Then, after some sustained pressure, Mykhailo Mudryk would put the game to rest with a perfect finish into the top corner.
So here are four things we have learnt from Chelsea's win against Heidenheim:
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Filip Jorgensen should be Chelsea's number one
The Denmark keeper was on fire for the Blues tonight in the Voith-Arena.
Making 11 saves in total, which prevented 2.41 goals. Chelsea were rescued by the summer signing on multiple occasions throughout the game.
Something which Jorgensen has done countless times in the competition, pulling out some big saves to keep Chelsea in front.
Furthermore, the game showed why Enzo Maresca might have to rethink who his number one is.
The second choice is to be calm on the ball and make the correct decision time after time with distribution, which makes you wonder when the manager will give him a deserved opportunity in the Premier League.
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Mykhailo Mudryk is knocking on the door to start in the Premier League
The winger once again had a vibrant and exciting performance on the left-hand side.
Cutting in and being brave enough to take on his man, he gave Omar Traore a tough time down the right, which worked well for Chelsea throughout the game.
It is becoming obvious the effect that Maresca has had on Mudryk, from someone who looked nervous or unwilling to take on his man it has now become the opposite.
Every time the Ukrainian international starts in the competition, he is constantly willing to take on his man and beats him nine times out of ten.
Three goals in four games in the competition so far have been a rather impressive display from Mudryk, and it will definitely make Maresca think about starting in the Premier League.
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Jadon Sancho is looking sharp following a spell on the sidelines
Like Mudryk, Sancho had a solid display on the opposite wing following two neat assists tonight.
What stood out the most was the forward's composure on the ball and his seemingly slowing down time to ensure he played the ball at the right weight and time.
It was questioned why Chelsea loaned Sancho in, but it has become apparent that it has been a clever signing for the West Londoners.
The former Borussia Dortmund man has five assists in six games so far this season, which just shows what confidence can do for a player in a different environment.
The two-time Champions League winners have an automatic buyout option if Chelsea finish above 14th in the Premier League. So far this season, this is looking likely for the Blues, and for £25m, it could become a steal.
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The backline played the offside trap to perfection
Chelsea had a back four of Renato Veiga, Benoit Badiashile, Tosin Adarabioyo and Axel Disasi.
It seemingly saw the West Londoners play a strong high line, with everyone at the back well placed. It showed the concentration and discipline that have clearly been drilled into them.
The offside flag saved Chelsea on a handful of occasions, and it frustrated the FC Heidenheim forwards on a number of occasions, with the hosts putting two in the Blues' net.
Furthermore, playing the risk of high land is the trust that Maresca has in each player. Disasi is doing a fine job at full-back, a position he has come to learn under Maresca so far this season.
