ATP - Belgrade

The ATP tour continues in Serbia.

2021 Serbia Open - an ATP 250 tournament, on Clay, in Belgrade, Serbia, 19-25 April 2021.

The event was last held in 2012 when Andreas Seppi (2) defeated Benoit Paire 6-3 6-2

It replaces the Hungarian Open, the final edition which was the 2019 tournament, won by Matteo Berrettini who defeated qualifier Filip Krajinovic 4-6 6-3 6-1

The following players withdrew after entering but before the main draw was published:

- Borna Coric replaced by Federico Delbonis 

- Gaël Monfils replaced by Federico Coria 

- Yoshihito Nishioka replaced by Soonwoo Kwon

- Dominic Thiem replaced by Juan Ignacio Londero 

- Fernando Verdasco replaced by Alexei Popyrin 

- Jiri Vesely replaced by Marco Cecchinato 

- Stan Wawrinka replaced by Ricardas Berankis 

Marton Fucsovics, sixth seed, withdrew after the main draw was published, and was replaced by lucky loser Roberto Carballes Baena.

Laslo Djere was instated as ninth seed and was moved to the spot previously occupied by Fucsovics in the draw.

Novak Djokovic, world number 1, is top seed.

The other 7 seeds are all in the top 49

The top four seeds have first round byes.