It was the 19th edition of the event known that year as the ABN AMRO World Tennis Tournament, and was part of the ATP World Series of the 1991 ATP Tour.
The 1991 ATP Championship Series, Single Week were part of the 1991 ATP Tour, the elite tour for professional men's tennis organised by the Association of Tennis Professionals.
The 1991 Australian Indoor Championships, also kown by its sponsored name Uncle Toby's Australian Indoor Tennis Championships, was a men's tennis tournament played on indoor hard courts at the Sydney Entertainment Centre in Sydney in Australia and was part of the Championship Series of the 1991 ATP Tour.
The 1991 Australian Men's Hardcourt Championships was a men's tennis tournament played on indoor hard courts in Adelaide, Australia and was part of the ATP World Series of the 1991 ATP Tour.
The even was part of the World Series category of the 1991 ATP Tour The tournament was played on outdoor hard courts and was held from January 7 to January 14.
The 1991 Grand Prix de Tennis de Lyon was a tennis tournament played on indoor carpet courts at the Palais des Sports de Gerland in Lyon in France and was part of the World Series of the 1991 ATP Tour.
It was the 11th edition of the event known that year as the Norstar Bank Hamlet Challenge Cup, and was part of the World Series of the 1991 ATP Tour.
The 1991 Stella Artois Championships was a men's tennis tournament played on grass courts at the Queen's Club in London in the United Kingdom and was part of the World Series of the 1991 ATP Tour.
The 1991 Torneo Godó was the 39th edition of the Torneo Godó annual men's tennis tournament played on clay courts in Barcelona, Spain and part of the Championship Series of the 1991 ATP Tour.
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1991 Riklis Classic, tennis tournament played on hard courts that was part of the World Series of the 1991 ATP Tour