The Guadalajara Open is a defunct tennis tournament that was played on the Grand Prix tennis circuit in 1978. The event was held in Guadalajara, Mexico and was played on outdoor clay courts. Gene Mayer won the singles title while Sandy Mayer and Sherwood Stewart partnered to win the doubles title.
|1978||Gene Mayer||John Newcombe||6–3, 6–4|
|1978|| Sandy Mayer
| Gene Mayer
|4–6, 7–6, 6–3|
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