Belinda Bencic has won the 10-year challenge.
This week the social media world is encouraging users to post pics of themselves from 10 years ago, alongside one from today for comparison.
There have been some absolute crackers from sports stars, celebrities and everyday people.
But tennis fans have gone into meltdown over Bencic’s effort.
— Belinda Bencic (@BelindaBencic) January 17, 2019
The 21-year-old star from Switzerland took to Twitter on Thursday with a photo of herself as an 11-year-old (approximately) alongside her hero Federer (then about 27).
The adorable pic was posted side-by-side with one from the 2019 Hopman Cup, where Bencic and Federer teamed up to win the event for the second-straight year.
Bencic’s post immediately went viral, receiving nearly 1000 retweets and 5000 likes in quick time.
Fans fell in love with the cute throwback, but many couldn’t believe how Federer hasn’t appeared to age at all in 10 years.
Roger Federer is a vampire.
— Rich's Coffee Shop (@RealRichPark) January 17, 2019
The best 10yearschallenge !!!! 😜😜
— adriana nagle (@drinagle) January 17, 2019
Congrats Belinda, you won the 10 year challenge.
— Peter Perweiler (@PeterP23) January 17, 2019
You’ve slain the boss in the 10-year Challenge:-D
— christian Berg (@christianberg) January 17, 2019
— Dinesh Burad (@cadburad) January 17, 2019
This is so damn good!
— Shannon Grixti (@shancake_) January 17, 2019
It's like he doesn't even age… There is no one quite like the GOAT.
— William Harmon (@TGF_William) January 17, 2019
Federer and Bencic’s special bond
Bencic helped Federer become the first player to win the Hopman Cup three times after Switzerland beat Germany in the final earlier this month.
The 20-time grand slam champion first won the Hopman Cup in 2001, when he teamed with Martina Hingis to beat the US.
The 37-year-old won his second crown alongside Bencic last year, beating Alexander Zverev and Angelique Kerber.
And it was the exact same script this year, with Federer winning his singles match in the final before helping clinch the deciding rubber in the mixed doubles.