Roger Federer, who along with Belinda Bencic, won all three matches against Great Britain, will face Frances Tiafoe and Serena Williams next in their tie against USA.
"It was great fun". Serena, what a pleasure, what an honour.
After much anticipation, the first set in the mixed rubber was a little disappointing, with neither Federer nor Serena returning any of the other's serves. "I used to practice with some women's players, when I was younger, you know, when I was maybe 15 and I was at the national tennis center and I used to play sets with the pro-women", said Roger Federer. "She is a great champion and you see how focused and determined she is and I love that about her".
14,064 people were in attendance at the event, making it the highest single session attendance in the history of the tournament. "I knew I could play better", she said. I think his serve is super underestimated, you can't read it.
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Federer and Bencic beat Britain's Cameron Norrie and Katie Boulter in their opening round-robin tie, while the United States of America lost to Greece on Monday despite Williams winning her singles tie.
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".
According to BBC, Switzerland, who won the cup previous year, will play Greece on Thursday in their final round-robin match, and the U.S. will take on Great Britain. He has a killer serve, - literally, you can't read it.
Earlier, Federer hardly broke sweat in his singles match against Tiafoe, taking his game up a notch at 4-4 in the first set to win 6-4 6-1. I've watched him all the time but I never realised how good it was.
However, it was some of the on-court battles between the tennis greats and their classy tributes to one another after the match that captured the tennis worlds' hearts.