Neil Mitchell has called on Nick Kyrgios to retire at the age of just 21.

It follows yet another controversy involving the troublesome tennis star.

‘I’ve had it,’ Neil Mitchell said.

‘He is an embarrassment to the sport, he’s an embarrassment to Australia and an embarrassment to the fans.’

Click PLAY below to hear Neil Mitchell’s full editorial

Neil Mitchell spoke with Andrew Bulley, who coached Kyrgios as a junior.

He said the on-court demeanour wasn’t a true reflection of him as a person.

‘He’s a really solid guy, off the court,’ he said.

Click PLAY below to hear more on 3AW Mornings