Alexander Zverev relied on his powerful serve to bail him out of trouble against Learner Tien, winning a tightly contested Australian Open quarterfinal on Rod Laver Arena.

Alexander Zverev is back in the Australian Open semi-finals - but he's sick of being asked about one specific topic.

Germany’s Alexander Zverev halted the comeback bid of young American Learner Tien and, rescued by his big serve at the key ...