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Rafael Nadal has been left conflicted over the ATP's punishment of Alexander Zverev. The German was withdrawn from the Mexico Open when he smashed the umpire's chair in the middle of an x-rated rant and was found guilty of a 'major offence'. He avoided a ban as he was slapped with a hefty fine and probation period instead, leaving world No 4 Nadal to worry that more players could follow Zverev's behaviour.

Zverev was the defending champion in Acapulco last month where he also entered the doubles draw with good friend Marcelo Melo, a former world No 1 in doubles.

A match tiebreak was needed to decide the winner as opponents Lloyd Glasspool and Harri Heliovaara went 8-6 up on what the world No 3 said was an unfair call, speaking a moment of anger from the defending champion.

"Look where the ball bounced. It's