The singles line up was headlined by Association of Tennis Professionals (ATP) No. 3, Australian Open runner-up, Philadelphia and Memphis winner Ivan Lendl, reigning Rome champion, ATP Comeback Player of the Year Thomas Muster, and Estoril titlist Emilio Sánchez.
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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.
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