This was the first edition of the tournament.
Zizou Bergs
Zizou Bergs (; born 3 June 1999) is a Belgian professional tennis player. He has a career-high Association of Tennis Professionals, ATP singles ranking of world No. 49, achieved on 19 May 2025 and a doubles ranking of No. 265, achieved on 27 Nove ...
won the title after defeating
Altuğ Çelikbilek 6–4, 3–6, 6–4 in the final.
Seeds
Draw
Finals
Top half
Bottom half
References
External links
Main drawQualifying draw
{{DEFAULTSORT:2021 Saint Petersburg Challenger - 1
Saint Petersburg Challenger - 1
St. Petersburg Challenger