Roger Federer stars in Belinda Bencic’s sweet #10YearChallenge flashback

The #10yearchallenge has taken over Instagram feeds lately, and we're especially loving when celebrities and sport stars get involved.

Now, Swiss tennis player Belinda Bencic has weighed into the trend, sharing her side-by-side comparison - only hers includes tennis legend Roger Federer.

The Swiss champion, 37, is pictured alongside Bencic, 21, when she was just a child.

Ten years later, Bencic is on court with Federer celebrating their joint win.

Federer and Bencic won the mixed doubles match against Serena Williams and Frances Tiafoe, of the United States, at the Hopman Cup in Perth on January 1.

They went on to take out their third Hopman Cup after defeating Germany in the final.

Bencic ran into Federer’s arms as they celebrated their victory.

Ahead of the Cup Bencic spoke about her joy on playing with her tennis idol saying, "That’s my highlight moment of the year, even if there are no points at stake".

Following their win in 2018 Bencic said, "It was a dream come true to win the Hopman Cup this year with Roger, I enjoyed every minute of it".

The pair had a red-faced moment following their defeat of Williams and Tiafoe when taking part in a post-match interview, reports the Express.

Bencic said: "It was very difficult but I am very happy — Roger motivated me in the locker room."

The reporter then asked, "I hope you’re not sharing locker rooms?" prompting Bencic to say, "No! Not in the locker room, in the gym. In front of the locker room."

Federer then jumped in to clear his name of any funny business.

"Just to be very, very clear here," he said.

"This cannot get any worse," Bencic laughed.

Bencic is due to play Petra Kvitová, of the Czech Republic, at the Australian Open in Melbourne, later today.