According to tennis.com, Serena Williams will be paired with fellow American Francis Tiafoe, while Federer will play with Belinda Bencic of Switzerland. "Thank you for making it possible", 20-times Grand Slam victor Federer, who is gearing up to defend his Australian Open title this month, said. Competitors play a men's and women's singles match along with the mixed doubles match.
"It was so fun to do this at the pinnacle of our careers", she continued.
Federer admitted that the prospect of facing his opponent was "nerve-wracking", particularly returning her serve.
"He has a killer serve". The winners of each group will contest Saturday's final.
Ahead of the day, Federer said the prospect of playing with Williams was "very exciting" for both of them, as he had a lot of respect for her both within the sporting world and outside of it. "People talk about her serve so much and I see why it is such a wonderful serve because you just can't read it", Federer said.
Williams raced to an early 3-0 lead against Bencic, but then lost her way as the Swiss number 54 gained successive breaks of serve to secure the first set.
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Serena's journey Down Under comes as she prepares to reclaim her title at the Australian Open next month, after missing out on the tournament past year due to her prior pregnancy.
Williams described Federer as the greatest of all time and said his serve was underrated.
'I like the energy he [Tiafoe] has, he's a really positive guy off court as well, ' Federer said.
Federer earlier defeated Tiafoe in straight sets.
"It was definitely a relief".
He added: "For me it was a bit nerve-racking, because all of a sudden you are serving, especially the last serve at 3-3, I'm telling myself I need to win this point, but it's Serena Williams".
Federer faced three break points in his first service game, but was near ideal from that point on as he wrapped up the contest in 57 minutes at RAC Arena on Sunday night. "That is the hard part in tennis - to keep that up".