The 2021 Saint Petersburg Challenger was a professional tennis tournament played on hard courts. It was the first edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Saint Petersburg, Russia between 1 and 7 March 2021.
Singles main-draw entrants
Seeds
1 Rankings as of 22 February 2021.
Other entrants
The following players received wildcards into the singles main draw: Ivan Gakhov Dominic Stricker Evgenii Tiurnev
The following players received entry from the qualifying draw: Zizou Bergs Lucas Catarina Artem Dubrivnyy Andrey Kuznetsov
Champions
Singles
Zizou Bergs def. Altuğ Çelikbilek 6–4, 3–6, 6–4.
Doubles
Christopher Eubanks / Roberto Quiroz def. Jesper de Jong / Sem Verbeek 6–4, 6–3.