1978 Louisville Open

The 1978 Louisville Open, also known as the Louisville International Tennis Classic, was a men's tennis tournament played on outdoor clay courts at the Louisville Tennis Center in Louisville, Kentucky, United States. It was the ninth edition of the tournament and was held from July 25 through July 30, 1978. The tournament was part of the Grand Prix tennis circuit. The singles final was won by fifth-seeded Harold Solomon who received $24,000 first prize money and earned 175 ranking points. It was Solomon's second title win at the tournament after 1976.

Singles
🇺🇸 Harold Solomon defeated 🇦🇺 John Alexander 6–2, 6–2
 * It was Solomon's 2nd singles title of the year and the 15th of his career.

Doubles
Víctor Pecci / 🇵🇱 Wojciech Fibak defeated 🇺🇸 Victor Amaya / 🇦🇺 John James 6–4, 6–7, 6–4