Is your tiredness physical or mental? If it is physical and you are fit and well then the suggestions on food and drink will help, if they don't then get checked up by your doctor.

Mental exhaustion can leave you feeling worn out as well. If you think it may be this then learn to spend less time in deep concentration during a game, we can only concentrate the mind for a limited time without becoming weary. Try and relax physically and mentally between shots, look at the scenery as you walk, hum a tune, speak to your other players. Get back in the concentration zone as you approach the ball again.

Hope this is of some help.

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Best Regards
Brian

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Funny o'l game!