Down to

 

In the headline above we can see an interesting use of 'down' as a verb. Let's see what the dictionary says about it. 

  be down to sb UK

 

to be someone's responsibility or decision:

I've done all I can now, the rest is down to you.

From that we can understand that the reason Foden struggled was not because of things that happened inside the pitch. 

What do you think, do problems that are not related to sports can influence an athlete's performance?