Guadalajara 1978
Gene Mayer won the title, beating John Newcombe 6–3 6–4 in the final.
Main draw 32 players
- 1🇺🇸Sandy MayerSemifinals · Lost to Gene Mayer
- 2🇦🇺John NewcombeFinal · Lost to Gene Mayer
- 3🇺🇸Butch WaltsRound of 16 · Lost to Gene Mayer
- 4🇺🇸Pat DupreRound of 16 · Lost to Ricardo Ycaza
- 5🇺🇸Sherwood StewartQuarterfinals · Lost to John Newcombe
- 6🇺🇸George HardieQuarterfinals · Lost to Sandy Mayer
- 7🇲🇽Marcello LaraQuarterfinals · Lost to Gene Mayer
- 8🇦🇺Ray RuffelsQuarterfinals · Lost to Ricardo Ycaza
- 🇺🇸Gene MayerFinal · Champion
- 🇪🇨Ricardo YcazaSemifinals · Lost to John Newcombe
- 🇺🇸Erik Van DillenRound of 16 · Lost to Marcello Lara
- 🇺🇸Ferdi TayganRound of 16 · Lost to Sandy Mayer
- 🇦🇺Paul KronkRound of 16 · Lost to Sherwood Stewart
- 🇳🇿Russell SimpsonRound of 16 · Lost to John Newcombe
- 🇮🇳Sashi MenonRound of 16 · Lost to George Hardie
- 🇺🇸Woody BlocherRound of 16 · Lost to Ray Ruffels
- 🇲🇽A MarquezRound of 32 · Lost to Sherwood Stewart
- 🇦🇺Bill LloydRound of 32 · Lost to Russell Simpson
- 🇧🇷Carlos KirmayrRound of 32 · Lost to Butch Walts
- 🇺🇸Dick BohrnstedtRound of 32 · Lost to Gene Mayer
- 🇨🇦Greg HalderRound of 32 · Lost to Marcello Lara
- 🇬🇧John FeaverRound of 32 · Lost to Paul Kronk
- 🇦🇺John JamesRound of 32 · Lost to Sandy Mayer
- 🇲🇽Octavio MartinezRound of 32 · Lost to George Hardie
- 🇺🇸Peter PearsonRound of 32 · Lost to Ricardo Ycaza
- 🇬🇧Richard LewisRound of 32 · Lost to John Newcombe
- 🇺🇸Rick FisherRound of 32 · Lost to Sashi Menon
- 🇲🇽Roberto ChavezRound of 32 · Lost to Erik Van Dillen
- 🇦🇺Steve DochertyRound of 32 · Lost to Pat Dupre
- 🇺🇸Steve KrulevitzRound of 32 · Lost to Woody Blocher
- 🇺🇸Trey WaltkeRound of 32 · Lost to Ferdi Taygan
- 🇺🇸Van WinitskyRound of 32 · Lost to Ray Ruffels