WThe Nordic Naturals Challenger is a professional tennis tournament played on outdoor hard courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually at the Seascape Sports Club in Aptos, California, United States, since 1988.
WThe Open Città della Disfida 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 at the Circolo Tennis Barletta in Barletta, Italy, since 1997.
WThe Intersport Heilbronn Open is a defunct professional tennis tournament played on indoor hard courts. It has been part of the Association of Tennis Professionals (ATP) Challenger Tour until 2014. It was held annually in Talheim, Germany, since 1984.
WThe Shimadzu All Japan Indoor Tennis Championships is a professional tennis tournament played on indoor carpet courts. It is currently part of the International Tennis Federation (ITF) ITF Women's World Tennis Tour. From 1997 to 2018, it was part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually in Kyoto, Japan, since 1997.
WThe Challenger ATP de Salinas Diario Expreso is a defunct professional tennis tournament played on outdoor hard courts. It has been part of the Association of Tennis Professionals (ATP) Challenger Tour. It was held annually in Salinas, Ecuador, from 1996 until 2014.
WThe San Luis Open Challenger Tour 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 San Luis Potosí, Mexico, since 1984 and also in 1980 and 1981 too.
WThe Tallahassee Tennis Challenger is a professional tennis tournament played on green clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually at the Forestmeadows Tennis Complex in Tallahassee, Florida, United States, since 2000.
WThe Tampere Open is a professional tennis tournament played on clay courts. It is currently part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held annually at the Tampere Tennis Center in Tampere, Finland, since 1982. There has been a women's future tournament for the last couple of years held at the same venue.
WThe Volkswagen Challenger was a professional tennis tournament played on indoor carpet courts. It was part of the Association of Tennis Professionals (ATP) Challenger Tour. It was held annually at the Tennisclub Grün-Gold Wolfsburg in Wolfsburg, Germany, between 1993 and 2012.
WThe Wrocław Open is a professional tennis tournament played on indoor hard courts. It is part of the Association of Tennis Professionals (ATP) Challenger Tour. It is held at the Hala Orbita in Wrocław, Poland.