The holder of 20 major singles titles, Federer, who is eyeing third successive Australian Open crown called the upcoming game a "once-in-a-lifetime" match-up which he is waiting for with excitement.
Camera IconStefanos Tsitsipas of Greece in action during the men's singles match between Frances Tiafoe of United States of America and Stefanos Tsitsipas of Greece on day 3 of the Hopman Cup tennis tournament at RAC Arena in Perth, Monday, December 31, 2018.
Federer and Bencic will next take on Williams and Frances Tiafoe to kick-start the New Year with arguably the most anticipated match in the tournament's three-decade history.
The match has been compared to the 1973 exhibition match known as Battle of the Sexes, where Billie Jean King roundly beat Bobby Riggs.
"I only know her from some champions' dinners at Wimbledon", Federer said.
Tickets were sold out soon after being released for the showpiece encounter, which pits Federer and Williams on court for the first time.
'It'll be great. I've been looking forward to it since I saw it. "This is so cool".More news: Here’s what CenturyLink said overnight about the outage
"It is very exciting for both of us and I hope a lot of tennis fans tune in and watch it", said Federer after opening his Hopman Cup campaign with an easy singles win on Sunday.
"You know I've been training offseason to be ready for Roger, so not sure how I'm going to do but we'll see".
"It is going to be one time, probably never again". My favorite players are Federer and Nadal even if I am aware that they are at the end of their career.
The match-up comes courtesy of the Hopman Cup, where eight teams representing their countries play in a round-robin format.
Competitors play a men's and women's singles match along with the mixed doubles match.
Norrie and Boulter defeated Greece on the opening day of the tournament in Australia, with Norrie's shock 7-6 (8) 6-4 victory over world No. 15 Stefanos Tsitsipas paving the way for Britain's victory. In an escalating argument, she called him a "thief" and accused him of stealing a point from her.