Second seed Karolina Pliskova of the Czech Republic also met little trouble in her 6-4, 6-3 win over Russia's Anna Blinkova.
Maracana SA chief executive Severiano Braga said one section of the pitch had already been replaced with positive results.
As expected, head coach Tite also called up Paris Saint-Germain pair Neymar and Marquinhos, Chelsea veteran Thiago Silva, Real Madrid midfielder Casemiro and Barcelona's Philippe Coutinho.
"I just came back from the training camp of the national team and everything is so familiar to me," said the 20-year-old side hitter, who helped China claim the World Cup title a year ago in Japan. "I will work with my teammates and get well prepared for the upcoming games."
"Players like Riqui have something special, but it is going to be very complicated for him here as there is a lot of competition. I have told him that he has a future here, and we will think about what is the best way to succeed at Barca," he added.
RIO DE JANEIRO, Sept. 18 (Xinhua) -- Fans will return to football matches in Rio de Janeiro next month after a six-month coronavirus ban, local authorities said on Friday.
Lin said when he told his my family members and friends yesterday he needed to leave China in order to play in the NBA again, "I cried."
This time, German sport is taking a step further, as all sports clubs are allowed to fill their halls or arenas to 20 percent capacity.
Cao Yunding had a goal disallowed in the 19th minute after the Shenhua's scorer tripped Tong Lei inside the box.
Djokovic beat his fellow Serb Filip Krajinovic 7-6 (7), 6-3, while Nadal won 6-1, 6-3 against Dusan Lajovic, also of Serbia.
"My buddy, I always believe you, support you and love you," Beijing teammate and Chinese international Zhai Xiaochuan wrote.