2021 Sparkassen ATP Challenger – Singles

Ilya Ivashka was the defending champion but chose not to defend his title.

Oscar Otte won the title after defeating Maxime Cressy 7–6(7–5), 6–4 in the final.

Seeds
• # 🇩🇪 Oscar Otte (champion)

• # 🇺🇸 Maxime Cressy (final)

• # 🇫🇷 Quentin Halys (second round)

• # 🇪🇨 Emilio Gómez (first round)

• # 🇮🇹 Federico Gaio (quarterfinals)

• # 🇪🇸 Fernando Verdasco (first round)

• # Marc-Andrea Hüsler (second round)

• # 🇮🇹 Alessandro Giannessi (first round)