The 1984 ATP Championship, also known as the Cincinnati Open, was a men's tennis tournament played on outdoor hard courts at the Lindner Family Tennis Center in Mason, Ohio in the United States that was part of the 1984 Volvo Grand Prix.

Third-seeded Mats Wilander won the singles title.

Mats Wilander defeated Anders Järryd 7–6, 6–3 Francisco González / Matt Mitchell defeated Sandy Mayer / Balázs Taróczy 4–6, 6–3, 7–6

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