Andrey Rublev
Andrey Andreyevich Rublev (; born 20 October 1997) is a Russian professional tennis player. He has been ranked as high as world No. 5 in men's singles by the Association of Tennis Professionals (ATP), which he first achieved in September 2021 ...
was the defending champion,
but lost in the quarterfinals to
Botic van de Zandschulp
Botic van de Zandschulp (; born 4 October 1995) is a Dutch professional tennis player. Van de Zandschulp has a career high ATP rankings, ranking of world No. 22 in singles by the Association of Tennis Professionals, ATP, achieved on 29 August 20 ...
.
Marin Čilić
Marin Čilić (; born 28 September 1988) is a Croatian professional tennis player. He has been ranked world No. 3 in men's singles by the Association of Tennis Professionals (ATP), achieved on 28 January 2018. Čilić has won 21 ATP Tour-level si ...
won the title, defeating
Taylor Fritz
Taylor Harry Fritz (born October 28, 1997) is an American professional tennis player. He has a career-high singles ranking of world No. 4 by the Association of Tennis Professionals (ATP), achieved on November 18, 2024, and a doubles ranking of ...
in the final, 7–6
(7–3), 4–6, 6–4.
Seeds
The top four
seeds
In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a ''testa''. More generally, the term "seed" means anything that can be sown, which may include seed and husk or tuber. Seeds are the ...
received a
bye into the second round.
Draw
Finals
Top half
Bottom half
Qualifying
Seeds
Qualifiers
Qualifying draw
First qualifier
Second qualifier
Third qualifier
Fourth qualifier
References
Main drawQualifying draw
{{DEFAULTSORT:St. Petersburg Open - Singles, 2021
2021 ATP Tour
2021 Singles
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 ...