Casper Ruud has called for a stop to “reckless behaviour” on the ATP Tour after angry incidents this year involving Nick Kyrgios and Alexander Zverev. Zverev was disqualified from the Mexican Open after smashing his racquet against an umpire’s chair while Kyrgios almost hit a ball boy with a racquet he smashed on the floor at Indian Wells. Ad/> Kyrgios has also been fined for angry outbursts in Indian Wells and the Miami Open, and American Jenson Brooksby hit a ball boy with a racquet he flung in anger in Miami.