Career
She competed every year at Wimbledon between 1951 and 1968, and at the French Open between 1952 and 1965. In the French Open, she reached the quarter-finals in 1957. Mercelis played for Belgium in the Federation Cup from 1963 to 1964 and from 1966 to 1969, losing all five singles matches, and winning two of her eight doubles matches.
In the Belgian Tennis Championships.
