claim: The defending champion of the 1979 Romika Cup - Singles and another tennis player are both tennis players. The other tennis player was defending champion at the 1994 Waldbaum's Hamlet Cup.
supporting_facts.key: Marc Rosset
supporting_facts.key: Guillermo Vilas
supporting_facts.key: 1994 Waldbaum's Hamlet Cup – Singles
supporting_facts.key: 1976 Bavarian Tennis Championships – Singles