"We need him to play first." Roger Federer's firm message for Nick Kyrgios.

Roger Federer has targeted kindly-delivered critisism at Aussie Nick Kyrgios for his role in the Channel Nine commentary box at the Australian Open.

The grand slam champion, who is now out of the competition himself, was interviewed following his third-round win over US’s Taylor Fritz on Friday.

The 37-year-old managed to diplomatically answer a call for his thoughts on Kyrgios’s position in the commentary team – something many people are questioning given his relative inexperience and attitude issues.

“We need him to play first before commentating, for the next 10 years,” Federer said, before complimenting the 23-year-old.

“Look, I like Nick. I like the way he plays. Yeah, I was happy to hear that he was in the commentary booth. He’s got a bit of time, sticks around, shows he’s passionate about the game.

“But we wish he was on the court rather than in a commentary booth.”

In other words, like everyone else, Federer wishes Kyrgios would stop wasting his talents.

Kyrgios lost to Canadian Milos Raonic 6-4, 7-6, 6-4 in the first round after failing to be seeded for the competition.

Federer, meanwhile, has missed out on winning a seventh Australian Open title after he was beaten by Greek young gun Stefanos Tsitsipas on Sunday night.

The match between the oldest and youngest player left in the competition (Tsitsipas is just 20 years old) was a nail-biter, coming down to multiple set and match points with tie-breakers in every set.

But in the end, Tsitsipas gained the upper hand winning 6-7 (11-13), 7-6 (7-3), 7-5, 7-6 (7-5) at Rod Laver Arena.

Stefanos Tsitsipas
Stefanos Tsitsipas after his history-making win. Image: Getty

He was, understandably, stoked, declaring in his post-match interview, "I'm the happiest man on Earth right now."

The quarter-finalist said the win was even more special because it was over his idol.

"Roger is a legend of our sport. So much respect for him," he said.

"I have been analysing him since the age of six. It was a dream come true for me just being on Rod Laver [Arena], facing him.

"And winning at the end, there is no way I cannot describe it."

Federer humbly said that he "lost to the better player".

"I hung in there, gave himself chances at some point, stayed calm. It's not always easy, especially for younger guys."