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This article is about a one-time tournament. For the tennis event held in Belgrade earlier in the year, see 2021 Serbia Open.
The 2021 Belgrade Open was a tournament on the 2021 ATP Tour. It was played on outdoor clay courts in Belgrade, Serbia. It was organised with a single-year licence in 2021, and was held at Novak Tennis Center from May 23 to 29, 2021.[1]
Novak Djokovic
Jonathan Erlich / 
Andrei Vasilevski
Novak Djokovic def. 
Alex Molčan, 6–4, 6–3
Jonathan Erlich / 
Andrei Vasilevski def. 
André Göransson / 
Rafael Matos, 6–4, 6–1
– Tournaments are affected by the COVID-19 pandemic