PERTH, Australia -- Serena Williams and Roger Federer have committed to play in the Hopman Cup mixed teams event in late December while former Australian Open champion Angelique Kerber and Alexander Zverev will represent Germany.
Frances Tiafoe will be Williams' partner for the United States, while Belinda Bencic will again represent Switzerland with Federer to defend the title they won in January over Kerber and Zverev in the final.
Williams and Federer are scheduled to play mixed doubles against each other when the U.S. meets Switzerland on Jan. 1.
The eight-country tournament is scheduled from Dec. 29 to Jan. 5 on indoor hard courts at Perth Arena. It's used by the players as a tuneup event for the Australian Open, which begins Jan. 14 in Melbourne.
Teams announced Wednesday:
Germany: Alexander Zverev and Angelique Kerber
Switzerland: Roger Federer and Belinda Bencic
United States: Frances Tiafoe and Serena Williams