2021 Challenger Biel/Bienne
The 2021 FlowBank Challenger Biel/Bienne was a professional tennis tournament played on indoor hard courts. It was the 1st edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Biel/Bienne, Switzerland between 20 and 26 September 2021.
Singles main-draw entrants
Seeds
1 Rankings are as of 13 September 2021.Other entrants
The following players received wildcards into the singles main draw:The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser: