During his club basketball career, Ruiz played in Uruguay, Argentina, and Brazil. In 1979, when he played with Atlético Welcome, Ruiz had a 70 point game in the Uruguayan Second Division. On 12 November 1983, while playing with Club Neptuno, he set the Uruguayan Federal Championship (Uruguayan First Division)'s all-time single game scoring record, when he scored 84 points in a league game against Colón.[2][3]
In that same Uruguayan Federal Championship 1983 season, he also had a 70 point game against Bohemios, on 7 November 1983, and a 72 point game against Hebraica Macabi. His scoring average during the Uruguayan Federal Championship 1984 season was 50.8 points per game. He finished his career in Uruguay as the Uruguayan Federal Championship (CFB)'s all-time leader in career points scored, having scored a total of 18,512 points in the league.[4]
As a member of Estudiantes de Bahía Blanca, of the top-tier level Argentine National League (LNB), he was the league's best scorer, during its first three years of existence (1985–1987). He averaged 32.9 points per in the Argentine LNB League's 1985 season, 31.5 points per game in the Argentine LNB League's 1986 season, and 30.4 points per game in the Argentine LNB League's 1987 season. The most points he ever scored in a single game, in the top-tier level Argentine League, was 60 points, in a game during the 1985 season.[5] He is the all-time leader in scoring average, in the history of the Argentine National League, with a career scoring average of 28.8 points per game.[6]