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.

Kazakhstan advanced to the United Cup mixed teams tennis tournament semifinals with an unassailable 2-0 lead over Germany, a team playing without injured world No. 2-ranked Alexander Zverev. Zverev was a late scratch on Wednesday because of a biceps injury.

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.

Alexander Zverev, the world No. 2-ranked tennis player, has withdrawn from the United Cup due to a bicep strain. Scheduled to play in Perth's quarterfinals, he was replaced by Daniel Masur. Zverev's withdrawal comes just weeks before the Australian Open,

World No. 2-ranked Alexander Zverev, 27, who won his opening two singles matches of the season, 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.

Kazakhstan have rolled into the United Cup semifinals after overcoming an Alexander Zverev-less Germany at RAC Arena to end their hopes of a successful title defence.

PERTH – World No. 2 Alexander Zverev pulled out of the United Cup on Jan 1 with a bicep strain, in what is a concern for the German star barely a week away from the Australian Open. The 27-year-old won his opening two games of the season against Brazil’s Thiago Monteiro and China’s Zheng Zhizhen.

World 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. The 27-year-old Zverev won his opening two singles matches of the season against Brazil’s Thiago Monteiro and China’s Zheng Zhizhen at the United Cup.

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.