2021 Erste Bank Open – Singles
Andrey Rublev was the defending champion, but chose to compete in St. Petersburg instead.
Alexander Zverev won the title, defeating Frances Tiafoe in the final, 7–5, 6–4.
Andrey Rublev was the defending champion, but chose to compete in St. Petersburg instead.
Alexander Zverev won the title, defeating Frances Tiafoe in the final, 7–5, 6–4.