The father of an unseeded Aussie tennis player John Millman says he’s “super proud” of his son, after he defeated world number two Roger Federer in four sets at the US Tennis Open.

He’s the first Australian man to reach the quarter-finals at the US Open since Lleyton Hewitt did it in 2006.

Millman, who’s ranked 55th in the world, won the nail-biting contest 3-6 7-5 7-6 7-6.

John’s father Ron Millman, fondly known as ‘The Fox’, tells Ben Fordham he hasn’t spoken to his superstar son yet and has only seen highlights of the match.

“Up until 10 minutes ago, I haven’t seen any of it.

“I haven’t spoken to John, nothing.”

Ron, who’s a teacher, jokes that his students were giving him regular score updates and his lessons certainly didn’t go to plan.

‘The Fox’ says he’s chuffed with how his son played, but is more proud of the man John’s become.

“I’m super proud of him.

“One, he’s such a good tennis player but I’m more proud of how he acts, the person he is and how he treats other people.”

Click PLAY below for the full interview with ‘The Fox’ Ron Millman

John’s sister Tessa has also praised her brother’s stunning performance, telling Ben she got emotional when she saw he’d pulled off the win.

“I just started crying! It was pretty embarrassing,” she says.

“He would be on cloud nine.”

Tessa jokes she feels like she had a part in the victory because she told her brother to win for her birthday, which is today.

Click PLAY below to hear from John Millman’s sister Tessa

Millman’s former tennis coach Ian Malpass says he never could have predicted today’s result but Millman has proved if you work hard, anything is possible.

“I knew he was determined, I knew he wanted to get everything he could out of himself, I knew how hard he worked.

“But to achieve this today, he’s proven… if you work hard you can get success.”

Click PLAY below for the full interview with Ian Malpass

Australian tennis champion Todd Woodbridge tells Ben Fordham the Brisbane-born Millman gave a “brilliant” performance.

“What he did today, he’s a case of never say never and work hard.

“He was able to beat one of the greatest of all time.”

Click PLAY below to hear from Todd Woodbridge

29-year-old Millman will play Novak Djokovic on Thursday.

Image: John Millman Facebook