She appeared in the French Open singles final in 1980, but lost in straight sets to Chris Evert.

[2] She regularly featured in the Romania Fed Cup team throughout her career, and began playing for them in 1973, two years before turning professional.

At Wimbledon 1978, Ruzici lost a notable match in the quarterfinal to the Australian Evonne Goolagong who was playing with an injured ankle.

When Goolagong recovered, Ruzici agreed to continue the match, but lost 7–5, 6–3 and was praised for her sportsmanship.

[3] It has been stated during TV commentaries that Ruzici's victory in 1980 at a tournament in Salt Lake City was watched by Richard Williams who was inspired by her triumph and prize money to teach his daughters Venus and Serena Williams to play tennis.