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.
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Aubameyang has, however, admitted to his fault and promised to get better.
After the game, he tweeted: "Today I missed; tomorrow Must Be better!"
Tomorrow for Aubameyang is next Saturday as Arsenal test West Ham United for size, and the Gabon international will hope to have his scoring boots on.