A 6-2, 6-4 loss to No. 27-ranked Lesia Tsurenko on Saturday cost second-seeded Osaka a place in the Brisbane International final and a move up to the No. 3 world ranking-which would be a record high for a player from Japan.
Wimbledon champion Kerber then overcome Bencic 6-4 7-6 (8-6) to level the tie. In the middle of November Zverev had defeated in the semifinals of the ATP finals in London, Federer in two sets (7:6, 7:5), he then won the final against Novak Djokovic (Serbia/6:4, 6:3).
Zverev, who beat the 20-time Grand Slam victor on his way to victory at last season's ATP Finals in London, had no answer to the Swiss legend this time around as Federer put his team 1-0 up in the tie.
In the finals in Switzerland was released by the German team of Alexander Zverev and Angelique Kerber. After the defeat of ATP Champion Zverev and the victory of Wimbledon victor Kerber, the dream of victory in the exciting 0:4, 4:1, 3:4 (4:5) ended in Mixed.
Smashing their way through the first set 4-0, Federer and Bencic looked like they would breeze past the Germans.
That means the final will feature the same four players as previous year, a first for the tournament in what is expected to be its final instalment.
It had been a statement performance that showcased Federer's fitness and determination, one of his best matches in many a month.
The tiebreaker too had its twists, Kerber needing three match points to seal the win. "I mean. Oh gosh", Zverev said, hand on hip.
It was not until Kerber's third match point that a backhand victor secured the 6-4, 7-6 (8/6) win.
"I'm curious to find out myself what will happen", said Federer, who has won the event a record three times.
It was a flawless 6-4 6-2 win over ATP Finals champion Zverev.
When asked if Williams had gifted one back, he said: "No, but that's her choice".