Flamengo have now won each of their past three league matches to move level on points with leaders Atletico Mineiro, who have a game in hand.
"I don't have much to say but that I was completely overplayed by Rafa, by a better player on the court," said Djokovic in the post-match conference.
The disruption to the 2020 F1 season caused by the COVID-19 pandemic meant the Eifel Grand Prix was a late addition to the calendar, with F1 returning to the Nurburgring for the first time since 2013.
He also revealed a plan to invite psychiatrists to help his team cope with the challenges.
He also hopes that Tokyo will host the world championships again soon after the Olympic Games.
Earlier on Thursday, Paraguay drew 2-2 at home to Peru and Uruguay beat Chile 2-1 in Montevideo.
"We played badly today, especially in the first quarter. We had many mistakes on the court, which was indescribable," rued Henan coach Li Jianxin. Enditem
The 28-year-old, who endured a difficult 18 months at Barcelona before being farmed out to the Bundesliga club in July 2019, has rediscovered his confidence since returning to the Camp Nou last month, shining in a central attacking midfield role behind Lionel Messi.
The new chapter seems to stand for an important milestone after having to compete in the shadow of his popular father over a decade, who disappeared from the public after an accident in 2013 and is treated in privacy.
Iga Swiatek of Poland kisses the trophy during the awarding ceremony after the women's singles final against Sofia Kenin of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 10, 2020. (Xinhua/Gao Jing)
Pundits and media speak about the four-time world champion no longer being a top-class international team.