She is the middle sibling of five children of cane farmers and was taught to play by her father, George, who was a top junior player. She attended school in Calen and received a tennis scholarship to the Australian Institute of Sport in Canberra. She turned professional at 18.
She became Australia's no. 1 ranked player in January of 2001. She won the Indian Open and reached the third round of the Australian Open in 2004.
In August 2006, at age 33, Pratt reached her first ever Tier I quarterfinal at Toronto. Soon after this she rose back up into the top 100. In 2007, Pratt entered the Sydney Medibank International where she reached the 2nd round. She was beaten by Kim Clijsters in straight sets. At the 2007 Australian Open, she was beaten in 1st round by Virginie Razzano of France.