What litigants and tennis-players must do (2,2,5)

'what litigants' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'tennis-players must do' is the wordplay.
I cannot quite see how this works, but
'tennis' could be 'court' (court tennis is a kind of tennis) and 'court' is found within the answer.
The remaining letters 'goto' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'and' acts as a link.

Can you help me to learn more?