Write an article that answers the following question: How many spots in the rankings was the difference between Petrova's starting and ending ranking?
Petrova was ranked world No. 76 going into the 2003 French Open. In the first round she beat the three-time champion and world No. 12 Monica Seles 6-4, 6-0, on what was to be Seles last professional match. She then defeated Silvija Talaja 6-1, 6-1 and Marissa Irvin 6-1, 6-1 to reach the fourth round. Here, Petrova stunned 7th seed Jennifer Capriati 6-3, 4-6, 6-3. In the quarterfinals, Petrova won again in three sets over 21st seed Vera Zvonareva 6-1, 4-6, 6-3 to reach her first ever Grand Slam semifinal. Petrova faced world No. 2, Kim Clijsters, and despite having a set point in the first set, Petrova was beaton in straight sets 7-5, 6-1. Despite this, Petrovas ranking increased to world No. 30.