In May 1977, Ycaza again defeated John McEnroe in three sets to win the World Championship of Tennis Men's 21-and-under tournament in Houston, Texas.

At the college level, he achieved All-American status for the 1976–1977 NCAA season playing for the University of Houston.

Ycaza represented Ecuador in Davis Cup matches from 1973 through 1986, teaming up with long-time friend and French Open champion Andrés Gómez in several important doubles triumphs against the likes of Argentina and Brazil.

After his playing days were over, Ycaza also served as Davis Cup captain for Ecuador.

His best year on the professional tour was 1980 when he won doubles tournaments at Sarasota, Palermo, and Santiago.