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The 1978 Rio de la Plata Championships, also known as the River Plate Championships, was a women's singles tennis tournament played on outdoor clay courts in Buenos Aires in Argentina. The event was part of the A category of the 1978 Colgate Series. The tournament was held from 30 October through 5 November 1978. Third-seeded Caroline Stoll won the singles title and earned $6,000 first-prize money.