Career
He also reached his only semi-final on the Grand Prix tennis circuit in 1979, at Bogota. He was a mixed doubles quarter-finalist in the 1986 French Open, with Mariana Perez-Roldan. The Ecuadorian reached the quarter-finals at Kitzbuhel in 1984 and Buenos Aires the following year.
In the mid-1980s he was part of the team which competed in the World Group and faced players like Jimmy Arias, Boris Becker and Miloslav Mečíř.
Viver finished with a 15/13 overall record, winning 14 of his 25 singles rubbers. Singles: (3)
Doubles: (3).