Gustavo Kuerten was the defending champion, and successfully defended his title against Àlex Corretja in the final 6–7(3–7), 7–5, 6–2, 6–0.
Bob Bryan and Mike Bryan were the defending champions, they lost to sixth-seeded Michaël Llodra and Fabrice Santoro in the semifinals.
Àlex Corretja was the defending champion but lost in the third round to Patrick Rafter.
David Nalbandian was the defending champion, but lost in the semifinals to Juan Mónaco.
The 2001 Energis Open tennis tournament was played in Amsterdam, Netherlands in July 2001.
Lisa Raymond was the defending champion, but lost in the semifinals to Dominique Van Roost.
Dan Goldie was the defending champion but did not compete that year.
The 1999 Thalgo Australian Women's Hardcourts – Singles was the singles event of the third edition of the Thalgo Australian Women's Hardcourts; a WTA Tier III tournament held in the Gold Coast. Ai Sugiyama was the defending champion but lost in the semifinals to Patty Schnyder.
Lucas Arnold and Tomás Carbonell won in the final 5–7, 7–5, 7–6(7–5) against Mariano Hood and Sebastián Prieto.
David Prinosil was the defending champion but lost in the second round to Roger Federer.
Àlex Corretja was the defending champion but lost in the semifinals to Jiří Novák.
Andy Murray became the first player since Andre Agassi in 1995 to successfully defend the title. He defeated Roger Federer 7–5, 7–5 in the final. It was also the first time in the tournament's history that the top four seeds reached the semifinals.
Yevgeny Kafelnikov was the defending champion and won in the final 7–6(7–2), 7–6(7–5) against Goran Ivanišević.
Pete Sampras was the defending champion.
Marc-Kevin Goellner and Richey Reneberg were the defending champions, but did not participate together this year. Goellner partnered Wayne Ferreira, losing in the quarterfinals. Reneberg partnered Jonathan Stark, losing in the semifinals.
Karol Kučera was the defending champion but lost to Àlex Corretja in the semifinals.
Karolína Plíšková was the defending champion, but lost in the semifinals to Dominika Cibulková.
This was the first edition of the tournament. Gero Kretschmer and Alexander Satschko won the title, defeating Víctor Estrella Burgos and João Souza in the final, 7–5, 7–6(7–3).
Henri Kontinen and Jarkko Nieminen were the defending champions, but Nieminen chose not to participate this year. Kontinen played alongside Robin Haase but lost in the final to Nicolás Almagro and Carlos Berlocq 5–7, 6–3, [11–9].
Bob and Mike Bryan were the two-time defending champions, but lost in the semifinals to Pierre-Hugues Herbert and Nicolas Mahut.
