How many male tennis players have been penalized with a point or a game for arguing with umpires? - Quora
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 sends warning to Alexander Zverev over umpire attack after German handed eight-week ban - Mirror Online
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ATP warns of harsh penalties for misconduct after Nick Kyrgios and Alexander Zverev's on-court outbursts » FirstSportz
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