Former Australian cricketer Shane Warne, one of the best bowlers in the history of the game, has penned an open later to Nick Kyrgios on his Facebook page.

The 46-year-old urged the controversial Aussie tennis star to learn from his mistakes and start showing the Australian people and the world that he wanted to be the best player in the world. “Show us what you’re made of and how hungry you are to be the best in the world,” he writes.

Here’s the full text of his Facebook:

“We all realise you're only 20 & have a lot to learn buddy. But please don't waste your talent, everyone in the world, especially us Australians want to respect u. Remember respect is way more important than being liked, u need to respect the game of tennis & yourself. We all make mistakes, but it's how we learn from them & the way we conduct ourselves when we lose that shows true character. You're testing our patience mate, show us what you're made of & how hungry you are to be the best in the world, it's time to step up & start winning, no excuses. No shame in losing, but show us you will never give up, that you will give it everything to be the best you can be, respect is earned not given! I believe in you & know you can do it, but now's the time my friend...”