New Delhi, Feb. 26 -- It was perhaps the heart of clay that led to her feat on clay. Mary Pierce holds three passports-US and Canada being the others-but she wears the tag of French with pride. Frenchwomen Amelie Mauresmo and Marion Bartoli have followed in the footsteps of the two-time singles Grand Slam champion with Major victories, but Pierce is the last home player to win women's singles at Roland Garros, in 2000....