1978 Romika Cup – Singles

Željko Franulović was the defending champion but lost in the semifinals to Buster Mottram.

Guillermo Vilas won in the final 6–1, 6–3, 6–3 against Mottram.

Seeds

 * 1) 🇦🇷 Guillermo Vilas (champion)
 * 2) 🇬🇧 Buster Mottram (final)
 * 3) 🇭🇺 Balázs Taróczy (semifinals)
 * 4)  Karl Meiler (quarterfinals)
 * 5)  Hans Gildemeister (second round)
 * 6)  Željko Franulović (semifinals)
 * 7) 🇺🇸 Pat Du Pré (first round)
 * 8)  Jiří Hřebec (first round)