Serbian tennis star Novak Djokovic was upset in the men's tennis semifinal by Germany's Alexander Zverev.
The loss means that Djokovic won't be able to complete a "golden slam" — winning all four major tournaments and an Olympic gold medal in a single year. Djokovic had won three majors already going into the Olympics.
Zverev, who isranked fifth, cried after beating the top-ranked player in the world 1-6, 6-3, 6-1. Djokovic will play for the bronze medal instead.
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