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The 1978 Alan King Tennis Classic was a men's tennis tournament played on outdoor hard courts at the Caesars Palace in Las Vegas, Nevada in the United States that was part of the 1978 Colgate-Palmolive Grand Prix. It was the seventh edition of the tournament was held from April 24 through April 30, 1978. Harold Solomon won the singles title after Barazzutti had to forfeit in the second set due to illness induced by food poisoning. Solomon earned $50,000 first-prize money as well as 225 Grand Prix points.
Harold Solomon
Álvaro Fillol / 
Corrado Barazzutti 6–1, 3–0 ret.
Bob Hewitt / 
Raúl Ramírez 6–3, 7–6