2021 Platzmann-Sauerland Open

The 2021 Platzmann-Sauerland Open was a professional tennis tournament played on clay courts. It was the first edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Lüdenscheid, Germany, between 16 and 22 August 2021.

Seeds

 * 1 Rankings as of 9 August 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Shintaro Mochizuki
 * 🇩🇪 Rudolf Molleker
 * 🇩🇪 Marvin Möller

The following player received entry into the singles main draw using a protected ranking:
 * 🇧🇪 Julien Cagnina

The following players received entry into the singles main draw as alternates:
 * 🇦🇷 Nicolás Kicker
 * Jelle Sels

The following players received entry from the qualifying draw:
 * 🇪🇸 Javier Barranco Cosano
 * 🇷🇴 Filip Jianu
 * 🇫🇷 Matteo Martineau
 * 🇦🇷 Genaro Alberto Olivieri

Singles

 * 🇩🇪 Daniel Altmaier def. Nicolás Jarry 7–6(7–1), 4–6, 6–3.

Doubles

 * Ivan Sabanov / Matej Sabanov def. 🇺🇦 Denys Molchanov / 🇰🇿 Aleksandr Nedovyesov 6–4, 2–6, [12–10].