Mathieu won 11 Grand Slam doubles championships: three women's doubles titles at Wimbledon (1933-34, 1937), six women's doubles titles at the French Championships (1933-34, 1936-39), and two mixed doubles titles at the French Championships (1937-38).
According to A. Wallis Myers and John Olliff of The Daily Telegraph and the Daily Mail respectively, Mathieu was ranked in the world top ten from 1929 through 1939 (no rankings were issued from 1940 through 1945), reaching a career high of world No. 3 in 1932 [REF].