Molina and Martina Navratilova teamed to win the 1974 French Open mixed doubles title, beating Rosie Reyes Darmon and Marcello Lara 6–3, 6–3 in the final. Together with Florenţa Mihai, he reached the French Open mixed doubles final in 1977, losing to Mary Carillo and John McEnroe. The 6-foot-tall (1.8 m) left-hander played 46 matches in the Davis Cup for Colombia from 1970 to 1979, winning 15 and losing 14 of his singles matches and winning 7 and losing 10 of his doubles matches. He reached his highest singles ranking of 22 in April 1976 on the Grand Prix. He is considered to be the best Colombian tennis player of all time.
Major finals 
Grand Slam finals 
Mixed doubles: 2 (1–1) 
|Outcome||Year||Championship||Surface||Partner||Opponents in the final||Score in the final|
|Winner||1974||French Open||Clay||Martina Navratilova|| Marcello Lara
Rosie Reyes Darmon
|Runner-up||1977||French Open||Clay||Florenţa Mihai|| Mary Carillo