- Source: 2021 Wolffkran Open
The 2021 Wolffkran Open was a professional tennis tournament played on carpet courts. It was the fifth edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Ismaning, Germany between 25 and 31 October 2021.
Singles main draw entrants
= Seeds
=1 Rankings are as of 18 October 2021.
= Other entrants
=The following players received wildcards into the singles main draw:
Max Hans Rehberg
Mats Rosenkranz
Henri Squire
The following player received entry into the singles main draw using a protected ranking:
Yannick Maden
The following players received entry into the singles main draw as alternates:
Tobias Kamke
Vitaliy Sachko
The following players received entry from the qualifying draw:
Matthias Bachinger
Jonáš Forejtek
Julian Lenz
Otto Virtanen
The following player received entry as a lucky loser:
Hiroki Moriya
Champions
= Singles
=Oscar Otte def. Lukáš Lacko 6–4, 6–4.
= Doubles
=Andre Begemann / Igor Zelenay def. Marek Gengel / Tomáš Macháč 6–2, 6–4.