Why Top Tennis Players Always Have Two Bottles on Court

If you’ve ever watched a professional tennis match, you’ve probably noticed that during changeovers, top players often drink from two bottles. Why does this happen, and what’s actually inside them?

This may surprise some people, but elite-level tennis is extremely unpredictable. Matches can last anywhere from 1 to 3+ hours, often played under extreme weather conditions such as high temperatures or humidity.

During a match, players lose significant amounts of fluids and essential electrolytes through sweat. If they don’t rehydrate properly, dehydration can build up and lead to fatigue, slower reaction times, and even muscle cramps.

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What’s in the two bottles?

1. Water for basic hydration

Water helps maintain fluid balance in the body and keeps the player hydrated. It is essential for regulating body temperature and ensuring proper cell function. However, water alone cannot replace the electrolytes lost through sweating.

2. Sports drink for electrolytes and energy

The second bottle usually contains a sports drink, which is packed with electrolytes such as sodium, potassium, and magnesium. These minerals are vital for muscle function and cramp prevention. Sports drinks may also contain carbohydrates to provide an energy boost, helping maintain stable blood sugar levels and sustain energy during long matches.

What’s inside the sports drink?

The exact composition varies, but it usually includes:

• Electrolytes, such as:
  • Sodium – helps retain fluids, replaces salt lost through sweat, and supports nerve function
  • Potassium – essential for muscle contraction and cramp prevention
  • Magnesium – important for energy production and muscle recovery
• Carbohydrates, which provide fast, easily digestible energy. During intense rallies and long games, muscles rely on glycogen (stored glucose) for fuel, and sports drinks help replenish these energy stores.
• Amino acids (optional), as some players prefer to add amino acids such as BCAAs (Branched-Chain Amino Acids) to their drinks.

Conclusion

Many professional tennis players work closely with nutritionists to determine their ideal hydration strategy. They often undergo testing to measure how much fluid and sodium they lose through sweat during a match. Based on these results, their drinks can be customized to ensure they effectively replace both fluids and electrolytes throughout competition