Input (grade 4): In singles, Petrova has reached a career high ranking of World No. 3 in May 2006 and has reached the semi-finals of the French Open in 2003 and 2005.
Output (grade 2): In singles, Petrova has a career high ranking of World No. 3 in May 2006. She has reached the semi-finals of the French Open in 2003 and 2005.