The match has been compared to the 1973 exhibition match known as Battle of the Sexes, where Billie Jean King roundly beat Bobby Riggs.
"It was a great experience, I am kind of sad it's over", Williams said.
"I guess what you're seeking here is confirmation to see is everything there that you thought there was, or is there any fixing still to be done in the coming weeks. This is so cool". "I think it's just now about maintaining, making sure I stay healthy, stay fit and inspired out there, come up with good solutions and take the right decisions at the right time", Federer said. I go to bed every night thinking, "How did I get through this day?"
Federer and Bencic required a tie-break to close out a very evenly-contested second set, losing three points in the breaker to seal victory.
'I like the energy he [Tiafoe] has, he's a really positive guy off court as well, ' Federer said.
It was Federer who emerged victorious in Tuesday's tie as Williams did not appear at her best during the doubles encounter, frequently feeling her right shoulder, which suggests she may have been hampered by injury.
She is targeting Margaret Court's record of 24 Grand Slam titles and could secure that honour this season. I only know her from some champions' dinners at Wimbledon.
Morning all and a happy new year.
America lost to Greece on Monday, while Switzerland has continued its ideal start after defeating Great Britain in its opener. Some commentators have suggested that Williams was penalized unfairly due to sexism and racism.
Federer will head into the clash in form after a masterclass 57-minute thrashing of Norrie.
He and teammate Bencic are the defending champions at Hopman.
Williams and Federer have each won the tournament twice, but never competed in the same year.