Born in Warsaw, Jagieniak left Poland at the age of four for France, where her father Czesław played rugby union professionally.

In 1995 she was a member of the Junior Fed Cup winning French side, which included Amélie Mauresmo.

[2] Jagieniak, who turned professional at 16, made her grand slam main draw debut at the 1997 French Open as a wildcard and was beaten in the first round by sixth seed Arantxa Sánchez Vicario.

Her WTA Tour main draw appearances came mostly in her native Poland, receiving wildcards to compete in Sopot on three occasions.

[3] Finishing up on the professional tour in 2001, she moved to the United States and studied at the University of Pennsylvania.