2021 Challenger Eckental – Singles

Sebastian Korda was the defending champion but chose not to defend his title.

Daniel Masur won the title after defeating Maxime Cressy 6–4, 6–4 in the final.

Seeds
• # 🇦🇺 Jordan Thompson (quarterfinals)

• # 🇨🇿 Jiří Veselý (quarterfinals)

• # 🇦🇹 Jurij Rodionov (first round)

• # 🇩🇪 Oscar Otte (first round)

• # 🇨🇿 Tomáš Macháč (semifinals)

• # 🇺🇸 Maxime Cressy (final)

• # 🇩🇪 Mats Moraing (withdrew)

• # 🇵🇱 Kacper Żuk (first round)