This was the first of the three tournaments held in Belgrade for the 2021 tennis season. Belgrade also hosted a joint ATP/WTA tournament.

Roberto Carballés Baena Roberto Carballés Baena (; born 23 March 1993) is a Spanish professional tennis player. He achieved a career-high Association of Tennis Professionals, ATP singles ranking of world No. 49 on 10 April 2023 and a career-high doubles ranking of wo ...

won the title after defeating

Damir Džumhur Damir Džumhur ( ; born 20 May 1992) is a Bosnian professional tennis player. His career-best singles ATP ranking of World No. 23, achieved on 2 July 2018, makes him the highest-ranked tennis player from Bosnia and Herzegovina. He is currently Bos ...

6–4, 7–5 in the final.

Seeds

Draw

Finals

Top half

Bottom half

References

External links

Main drawQualifying draw
{{DEFAULTSORT:Belgrade Challenger - 1 2021 ATP Challenger Tour

2021 1 1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to sp ...