It was only a matter of time.
Midfielder Mathieu Flamini, on his second stint at Arsenal, had never lost a match he started at the Emirates Stadium prior to a Diego Costa-led Chelsea win over 10-man Arsenal.
He's now played 54 games at the Emirates: won 37, drawn 16 and lost once.
The defensive midfielder didn't enjoy his best display in his role, either, spurning a handful of chances as Arsenal searched for an equaliser after Costa put the visitors ahead in the first half.
Mathieu Flamini's first loss at the Emirates. And you can't say he didn't contribute. pic.twitter.com/MkUD5E0h0R— James Benge (@jamesbenge) January 24, 2016
Flamini loses his first ever game at the Emirates https://t.co/aWoNO9GZVv— Football News (@TransferBibIe) January 24, 2016