The top-seeded pair of Coco Gauff and U.S. Open finalist Taylor Fritz of the United States are into the United Cup mixed teams tennis quarterfinals.

Coco Gauff and Taylor Fritz powered the U.S., tournament winner two years ago, into the semifinals of the United Cup mixed teams tennis event on Wednesday.

Alexander Zverev eased past Thiago Monteiro 6-4 6-4 as Germany beat Brazil for a winning start to their United Cup defence on Sunday while the Czech Republic got the better of Norway in a hard-fought match.

Kazakhstan has advanced to the United Cup mixed teams tennis tournament semifinals with an unassailable 2-0 lead over a German team playing without the injured world No. 2-ranked Alexander Zverev.

No. 2-ranked Alexander Zverev withdrew from the United Cup mixed teams tennis tournament on Wednesday with a biceps strain less than two weeks from the start of the Australian Open

Elena Rybakina's Kazakhstan dumped defending champions Germany out of the United Cup on Wednesday with Alexander Zverev sidelined by an arm injury barely a week away from the Australian Open, while top seeds USA beat China to reach the semi-finals.

Germany's world number two Alexander Zverev pulled out of the United Cup on Wednesday with a bicep strain barely a week away from the Australian Open.

Title holders Germany were knocked out of the United Cup on Wednesday when they fell 2-1 against Kazakhstan in the quarter-finals in the absence of their injured top player Alexander Zverev. World number six Elena Rybakina opened the tie in Perth with a commanding 6-3,

World No.2 Alexander Zverev won't play in Germany's quarter-final clash with Kazakhstan at the United Cup due to a biceps injury.