Reuters - If tennis player Nick Kyrgios has been chastened by a warning about his future behaviour from Australia's chef de mission for the Rio Olympics, he is not showing it.

Kyrgios and his fellow Australian young gun Bernard Tomic were told by chef de mission Kitty Chiller on Saturday that their behaviour must improve if they wanted to represent their country at the Rio Olympics.

The talented and hugely confident Kyrgios hit back with some cheeky humour from the Madrid Open, where he hit a stunning lob between his legs on his way to defeat at the hands of Kei Nishikori in the quarter-finals.

"Someone tell that Kitty chiller to watch that tweener lob, then she will understand why I'm on watch for the olympics lol," he posted on Twitter.