Novak Djokovic also remained in contention for a pair of gold medals. After crushing Kei Nishikori in men’s singles, the 20-time major champ partnered Nina Stojanovic to a 6-1, 6-2 victory over Germans Laura Siegemund and Kevin Krawietz to reach his second semifinal of the day.
Alexander Zverev will look to halt Djokovic’s bid for a Golden Slam in the final four. The German eased past Jeremy Chardy, 6-4, 6-1, and now hopes to snap a four-match losing streak against the world No. 1.