|Born||16 February 1958|
|Height||1.83 m (6 ft 0 in)|
|Highest ranking||No. 44 (July 20, 1981)|
|Grand Slam Singles results|
|French Open||4R (1981)|
|US Open||3R (1977)|
|Highest ranking||No. 49 (December 29, 1980)|
His most noteworthy achievement was winning the 1976 US Open Junior tournament. In the semifinals of that tournament he staged a third-set comeback to defeat John McEnroe 6–4, 5–7, 7–6(4) after saving two match points at 2–5 in the third set and after coming back from 2–4 in the third-set tiebreaker. (Ycaza was to face McEnroe three more times in junior tournaments, winning each time.) In the final, Ycaza defeated José Luis Clerc of Argentina. In May 1977, Ycaza again defeated John McEnroe 6–7, 6–4, 6–2 to win the World Championship of Tennis Men's 21-and-under tournament in Houston, Texas.
Coached by Miguel Olvera at the Guayaquil Tennis Club, Ycaza had a successful junior career, winning numerous South American junior titles. 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.
Ycaza played on the professional tennis tour from 1977 to 1986. His career high rankings were World No. 45 in singles and No. 32 in doubles. During his professional career, he won three doubles tournaments (each with different partners). His best year on the professional tour was 1980 when he won doubles tournaments at Sarasota, Palermo, and Santiago.
ATP Tour finals
Doubles (3 titles)
|Win||1–0||Feb 1980||Sarasota, USA||Clay||Andrés Gómez|| David Carter
|Win||2–0||Sep 1980||Palermo, Italy||Clay||Gianni Ocleppo|| Víctor Pecci
|Win||3–3||Nov 1980||Santiago, Chile||Clay||Belus Prajoux|| Carlos Kirmayr
|4–6, 7–6, 6–4|
Doubles runners-up (4)
- 1978: Tulsa (with Carlos Kirmayr, lost to Russell Simpson and Van Winitsky)
- 1980: Bordeaux (with Gianni Ocleppo, lost to John Feaver and Gilles Moretton)
- 1980: Bogotá (with Andrés Gómez, lost to Álvaro Fillol and Carlos Kirmayr)
- 1981: Quito (with David Carter, lost to Hans Gildemeister and Andrés Gómez)