Pierre-Emerick Aubameyang has tasked himself to get his finishing game 'better' after underwhelming in Arsenal's loss to Chelsea on Saturday.
With the Blues leading through a Pedro effort, the Gabon international shot high a clear chance from Hector Bellerin's cutback in the 19th minute.
53 seconds later, opposite number Alvaro Morata doubled Chelsea's lead.
Although Henrikh Mkitaryan and Alex Iwobi found the perfect response to the hosts' questions before the interval, Marcus Alonso netted the winner late in the game.
Aubameyang has, however, admitted to his fault and promised to get better.
After the game, he tweeted: "Today I missed; tomorrow Must Be better!