Here the star takes help - from the audience: "You're fired"

Strange scenes unfolded in the meeting between Novak Djokovic and Nick Kyrgios.

In the middle of the match - which was a preparation for the Australian Open - Djokovic ran up to the crowd and received tips on how to serve.

The advice seems to have worked - as Djokovic won the next ball.

The 35-year-old then showed his appreciation by giving the supporter in the stands a high five.

- You get fired, he also shouted to coach Goran Ivanisevic.

Watch the clip in the player above.