Background
Valerio learned playing tennis from her father and she played on a tennis court at her home.
Valerio learned playing tennis from her father and she played on a tennis court at her home.
Before settling on tennis she practiced fencing, horse riding and skiing. Her favorite strokes were the forehand passing shot and cut service. Between 1928 and 1938 she participated in seven Wimbledon Championships.
Her best result in the singles event was reaching the quarterfinal of the 1933 Wimbledon Championships in which she was defeated by eventual finalist Dorothy Round.
That same year she partnered with Madzy Rollin Couquerque to reach the third round of the doubles competition. In 1935 she reached the quarterfinal of the mixed doubles event with Don Turnbull which they lost to the first-seeded pair Hilde Spehrling and Gottfried Von Cramm.
In 1930 she played against Phyllis Satterthwaite in the final of the Bordighera tournament on the Italian Riviera. Satterthwaite was a baseline player with a game based on safety and keeping the ball in play.
At match point her determination not to make an error resulted in a rally which lasted 450 strokes.
At the French Championships she reached the quarterfinal in 1931 and 1934. Additionally she was a runner-up at the inaugural 1930 championships as well as the 1932, 1934 and 1935 editions. Singles: 7 (2 titles, 5 runners-up).