He made the third round again at the 1966 French Championships, but this time featured in the tournament, with wins over Mike Belkin and Terry Ryan.

His most famous moment came in the 1967 Davis Cup when he defeated Arthur Ashe in the reverse singles to complete a surprise victory for Ecuador over the United States in the Americas Inter-Zonal Final.

[5] Ecuador widely celebrated the win across the country and the El Universo newspaper used a headline that translates to "A victory for history" to describe to triumph.

[8] Later in the year he competed in the exhibition tournament for tennis at the 1968 Summer Olympics and won a bronze medal in men's doubles with Teimuraz Kakulia.

[9] At the 1969 Canadian Open he made it as far as the quarter-finals of the singles, where he was two points away from upsetting top seed John Newcombe in the fifth set, as well as making the semi-finals in the doubles, with Dick Crealy.