The top-ranked Serb never gave Nishikori a chance in a 6-2, 6-0 rout of the home favorite from Japan to reach the semifinals of the tennis tournament at the Tokyo Olympics on Thursday.
The 12th-ranked Bencic beat Elena Rybakina of Kazakhstan 7-6 (2), 4-6, 6-3 on Thursday to reach the gold-medal match at the Tokyo Games.
The decision was taken after requests from players who had struggled to play in hot and humid conditions.
Elina had notched one of the best wins of her career at the previous Olympics, when she defeated defending gold medallist Serena Williams at 2016 Rio en route to a quarterfinal finish.
Daniil Medvedev was struggling so much with the suffocating heat and humidity that at one point the chair umpire asked him if he could continue playing.
The disappointment came just four days after Osaka left the nation teary-eyed by running up a Mount Fuji-like set at the National Stadium and lighting the Olympic cauldron with her torch to open the Olympics.
The second-ranked Osaka, who was born in Japan and grew up in the United States, struggled with her usually reliable groundstrokes.
Djokovic is attempting to become the first man to win all four Grand Slam titles and Olympic gold in the same calendar year.
Nagal had won his first round against Uzbekistan Denis Istomin for India's first men's singles win at Olympics in 25 years.
The host country’s superstar stepped up her game when she needed to in a 6-3, 6-2 win over 49th-ranked Viktorija Golubic.
Osaka hadn't played since she withdrew from the French Open in May to take a mental health break, revealing that she has dealt with depression. She then sat out Wimbledon.
The International Tennis Federation is giving Olympics players extra time during breaks in play after facing criticism for staging matches during the highest heat of the day.
Sania and Raina were running away with the contest after bageling their opponents but in a dramatic turnround, the Kichenok sisters came back from the dead to pull off a 0-6 7-6(0) 10-8 win.
Daniil Medvedev, representing the Russian Olympic Committee (ROC) team since Russia is banned, also won his first-round match against Alexander Bublik of Kazakhstan 6-4, 7-6(8).
Heat and humidity quickly became a major issue when the Olympic tennis tournament opened Saturday. The temperature soared to 93 degrees F (34 degrees C) and the heat index made it feel more than 100 F (38 C).
India's Sumit Nagal beat Denis Istomin of Uzbekistan in three sets to enter the second round at 2020 Tokyo Olympics.
The four-time Grand Slam winner lit the cauldron at the opening ceremony of the Tokyo Olympics on Friday.
Mirza, who is making a record fourth Olympic appearance, and debutant Raina are going into the Olympics without playing a single competitive match together this year
Djokovic is attempting to become the first man to complete a Golden Slam by winning all four major tennis tournaments and an Olympic singles gold medal in the same year.
A first-round win for the 23-year-old Indian could see him face second-seeded Russia's Daniil Medvedev.
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