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 Country Player Rank1 SeedPierre-Hugues Herbert981Henri Laaksonen1192Dennis Novak1213Tomáš Macháč1434Liam Broady1455João Sousa1506Marc-Andrea Hüsler1607Cem İlkel1768 1 Rankings are as of 13 September 2021.
Other entrants The following players received wildcards into the singles main draw: Jérôme Kym Leandro Riedi Dominic Stricker
The following players received entry into the singles main draw as alternates: Matthias Bachinger Andrey Kuznetsov
The following players received entry from the qualifying draw: Antoine Escoffier Hiroki Moriya Jakub Paul Alexander Ritschard
The following player received entry as a lucky loser: Alexander Shevchenko
Champions Singles
Liam Broady def. Marc-Andrea Hüsler 7–5, 6–3.
Doubles
Ruben Bemelmans / Daniel Masur def. Marc-Andrea Hüsler / Dominic Stricker Walkover.
References