- Source: 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.
Singles main draw entrants
= 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
Champions
= 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].