The mystery behind 's seemingly bizarre habit involving a drink bottle during his matches appears to have been solved.The men's top seed, who plays British hope for a spot in the final, has set tongues wagging on social media after he was caught on camera 'inhaling' contents from a bottle during a change of ends.The Serb appeared to check with his support crew sitting courtside during his last-16 win over Tim van Rijthoven before breathing in the contents rather than drinking them.
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