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Alexander Zverev downs Learner Tien in Australian Open quarters

Still seeking his first Grand Slam championship, Alexander Zverev is through to the semifinals of the Australian Open for the third year in a row. The third-seeded German defeated 25th-seeded Learner Tien of the United States 6-3, 6-7 (5), 6-1, 7-6 (3) on Tuesday in Melbourne.

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