Chelsea ended 2019 with back-to-back away wins over Tottenham Hotspur and Arsenal.
In many ways, it was the perfect way to rubber stamp their dominance in London during a decade which has seen them win every single major trophy available to them.
The two performances against their London rivals were contrasting as they dominated against Spurs, but had to dig in and come from behind to beat the Gunners at the Emirates Stadium.
Blues head coach Frank Lampard can take a lot of credit for the turnaround as his decision to withdraw Emerson Palmieri for Jorginho allowed the visitors to gain a foothold in the game after being overrun in midfield.
The other significant change was to hand Tariq Lamptey his senior debut.
Fikayo Tomori - moved to right-back following the change in formation - wasn't having the best of times up against Pierre-Emerick Aubameyang and Bukayo Saka down the Gunners' left-hand side.
So to turn to someone with no experience at the top level was certainly a risk - one that ultimately paid off as Lampard ruined Mikel Arteta's first home game as Arsenal head coach.
Lamptey didn't actually play a role in Tammy Abraham's winning goal, but what he did after the ball had hit the back of net has prompted laughter amongst some Chelsea fans.
As spotted by a supporter on Reddit, Lamptey can be seen trying to join in the celebration but it appeared he had a rather difficult time in trying to do so - maybe because of his height!
The fan who uploaded the image said:
"A 5ft 4 Tariq Lamptey trying to join the celebration is the easily the most adorable thing to see right now."
For Lamptey, the 2-1 win over Arsenal is a game he will never forget.
"My heart was racing," he told the club's in-house media channel. "I was thinking that this is the moment that me and my family have been waiting for, for a long time. Ever since I joined the club at the age of eight.
"Frank just said to me, be you, play your normal game and go out and enjoy it."
