1/10
Alexander Zverev of Germany signs autographs after defeating Learner Tien of the U.S. following their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Aaron Favila
2/10
Alexander Zverev, right, of Germany is congratulated by Learner Tien, left, of the U.S. following their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Aaron Favila
3/10
Alexander Zverev of Germany plays a backhand return to Learner Tien of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Asanka Brendon Ratnayake
4/10
Learner Tien of the U.S. plays a forehand return to Alexander Zverev of Germany during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
5/10
Alexander Zverev of Germany plays a backhand return to Learner Tien of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
6/10
Learner Tien of the U.S. plays forehand return to Alexander Zverev of Germany during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
7/10
Alexander Zverev of Germany plays a backhand return to Learner Tien of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
8/10
Learner Tien of the U.S. plays a backhand return to Alexander Zverev of Germany during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
9/10
Alexander Zverev of Germany plays a forehand return to Learner Tien of the U.S. during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
10/10
Learner Tien of the U.S. plays a backhand return to Alexander Zverev of Germany during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. | Photo: AP/Dita Alangkara
