Novak Djokovic retires from his Australian Open semifinal after losing the first set against Alexander Zverev

Novak Djokovic retires from his Australian Open semifinal after losing the first set against Alexander Zverev.

By The Associated Press

The Associated Press

MELBOURNE, Australia — Novak Djokovic retires from his Australian Open semifinal after losing the first set against Alexander Zverev.

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The Associated Press

The Associated Press