In professional tennis, is there any charge to the player if he or she asked for the trainer?

Question

Do the service provided by trainer on court to the player come as a free of charge? If not what sort of fee do the trainer charge.

Answer 1

No financial cost, but it can cost them later in the sense that if the injury occurs again, but more acutely, they will have "spent" their one opportunity to get treatment from a trainer for THAT specific injury. At a later point in the match they may need that treatment more.

Answer 2

no

Answer 3

No.