Nick Kyrgios, Alexander Zverev angry on-court incidents lead to ATP player warning of tougher punishments for misconduct - ABC News
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Rafael Nadal's next opponent fires massive US Open warning ahead of last 16 tie | Tennis News - Hindustan Times
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Rafael Nadal sends warning to Alexander Zverev over umpire attack after German handed eight-week ban - Mirror Online
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Maria Sakkari reveals Angelique Kerber warning, Caroline Garcia 'reaching her potential' - WTA Finals Diary - Eurosport
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Serena Williams Wimbledon warning shows fear-factor of tennis icon despite 12-month hiatus | Tennis | Sport | Express.co.uk
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