The CittÃÂ di Biella (formerly known as Challenger Thindown Biella, Pulcra Lachiter Biella and Canella Challenger) is a professional tennis tournament played on outdoor red clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually in Biella, Italy, since 1998. After a 3 year hiatus, it came back in 2025 as the Challenger CittÃÂ di Biella.