Cricketers sip fluids between overs during matches. Tennis players take a swig of fluids after every two games. Footballers do not miss an opportunity to hydrate at every given moment.
Hydration needs for athletes vary. Their coaches and support staff ensure that they take the right fluids, with added carbohydrates and salts before, during and after their games or training sessions.
Important Hydration Guidelines for Athletes
How much fluid intake by an athlete?

Small loss of water and salts from the body has little or no effect on the performance of athletes. Severe dehydration however, can have a direct impact on their performance.
Coaches and athletes are well advised to have a fluid plan that is designed to suit the needs of their sport. As a thumb rule, that is about 2% of the body mass or one kilo for a person who weighs 50 kilos.
Occasionally, there may be a tendency to drink more than the sweat losses. Typically, this happens when people who exercise for recreational workouts at a low intensity and drink more fluid than they should. This can be dangerous.
Intake right fluids for good beginning

Choosing the right sports drink

Source: https://www.powerade.co.nz/sports-hydration/powerade-and-the-science-of-hydration
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