23 Jan 30 Jan | U.S. Pro Indoor Philadelphia, US Carpet – $300,000 – 48S/24D Singles – Doubles | 
SeptemberGrand Prix rankings''*The official ATP year-end rankings were listed from January 2, 1985.''
List of tournament winnersThe list of winners and number of singles titles won, alphabetically by last name:
- Juan Aguilera Aix-en-Provence, Hamburg
- Vijay Amritraj Newport
- Francesco Cancellotti Florence, Palermo
- Dan Cassidy Melbourne
- Jimmy Connors Memphis, La Quinta, Boca West, Los Angeles, Tokyo Indoor
- Marty Davis Honolulu
- Mark Dickson Houston WCT, Toulouse
- Peter Doohan Adelaide
- Stefan Edberg Milan
- John Fritzgerald Sydney Outdoor
- Vitas Gerulaitis Treviso
- Brad Gilbert Columbus, Taiwan
- Andrés Gómez Nice, Rome, Washington, D.C., Indianapolis, Hong Kong
- José Higueras Kitzbühel, Bordeaux
- Anders Järryd Hilversum, Sydney Indoor
- Aaron Krickstein Boston, Tel Aviv, Geneva
- Johan Kriek Bristol, Livingston
- Ramesh Krishnan Metz
- Henri Leconte Stuttgart Outdoor
- Ivan Lendl Luxembourg, French Open, Wembley
- John McEnroe Philadelphia, Richmond WCT, Madrid, Brussels, Queen's Club, Wimbledon, Dallas WCT, Forest Hills WCT, Toronto, US Open, San Francisco, Stockholm, Masters
- Paul McNamee Houston
- Matt Mitchell Melbourne Indoor
- Terry Moor Cleveland
- Joakim Nyström Gstaad, North Conway, Basel, Cologne
- David Pate Tokyo Outdoor
- Libor Pimek Munich
- Danny Saltz Auckland
- Henrik Sundström Bari, Monte Carlo, Båstad
- Eliot Teltscher Brisbane, Johannesburg
- Mats Wilander Cincinnati, Barcelona, Australian Open
- Tim Wilkison Vienna
The following players won their first title in 1984:
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