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.
1990 | Australian Open | French Open | 1990 in music | Open University | open source | U.S. Open | Estoril | Wacken Open Air | 1990 FIFA World Cup | 1990 ATP Tour | The Open Championship | Americans with Disabilities Act of 1990 | U.S. Open (tennis) | All England Open Badminton Championships | U.S. Open (golf) | Open Source | Open-pit mining | 2006 Australian Open | 1990 in baseball | Open Software Foundation | Indira Gandhi National Open University | Lamar Hunt U.S. Open Cup | 2005 Australian Open – Men's Singles | 1990–91 in English football | U.S. Women's Open | open access | Gerry Weber Open | 1990 Vuelta a España | 1990 in television |