Originally Posted by Emanuelli
I'd say that it is correct to use the preposition "behind". Besides "run after" has a different meaning.>>
run after informal seek to acquire or attain; pursue persistently: businesses which have spent years running after the baby boom market.*
seek the company of (someone) with the aim of developing a romantic or sexual relationship with them
Maybe you want to mean to pursue the ball persistently.. Well in that case I think it is correct to say "run after". When you use "behind" you are only saying where the players are running.
If you say "in front of the ball" it'd be the same as with "behind the ball" It shows where the players are situated.