The Kunal Patel San Francisco Open is a professional tennis tournament played on outdoor hard courts. It is currently part of the ATP Challenger Tour. It is held annually in San Francisco, United States since 2017.[1] The inaugural event was held February 2017, at the Bay Club SF Tennis Center, the West Coast's largest indoor tennis facility.[2][3] Since 2021, the tournament has been held at the Lisa and Douglas Goldman Tennis Center in San Francisco, CA.