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]
See main article: 2021 Belgrade Open – Singles.
Novak Djokovic def. 
Alex Molčan, 6–4, 6–3See main article: 2021 Belgrade Open – Doubles.
Jonathan Erlich / 
Andrei Vasilevski def. 
André Göransson / 
Rafael Matos, 6–4, 6–1