Footballers are very talented individuals but every so often they have an off day.
And now, it's easier than ever to measure who isn't contributing effectively.
So who wasn't doing their job or just had a bad day at the office over the weekend in the Premier League and FA Cup fixtures?
Scroll through the gallery using the arrow above, right, to see every club's worst performing player, based on their WhoScored.com rating.
*Players must have been involved for at least 60 minutes of their match