The 1978 U.S. Clay Court Championships was a combined men's and women's tennis tournament that was held at the Indianapolis Racquet Club in Indianapolis in the United States and played on outdoor clay courts. It was the 10th edition of the tournament in the Open Era and was held from August 7 through August 13, 1978. First-seeded Jimmy Connors won the men's singles title and the accompanying $24,000 first-prize money, while college amateur Dana Gilbert took the women's championship.[1] [2]
See main article: 1978 U.S. Clay Court Championships – Men's singles. 
Jimmy Connors defeated 
José Higueras 7–5, 6–1
See main article: 1978 U.S. Clay Court Championships – Women's singles. Dana Gilbert defeated 
Viviana González 6–2, 6–3
See main article: 1978 U.S. Clay Court Championships – Men's doubles. Hank Pfister / Gene Mayer defeated Jeff Borowiak / 
Chris Lewis 6–3, 6–1
See main article: 1978 U.S. Clay Court Championships – Women's doubles. 
Helena Anliot / Helle Sparre-Viragh defeated Barbara Hallquist / Sheila McInerney 6–3, 6–1