Passage: Petrova next headed to 2009 MPS Group Championships as the top seed, where she defeated Olga Govortsova, Madison Keys (who had just won her first main-draw match), and Alona Bondarenko. She fell in the semifinals to eventual finalist Aleksandra Wozniak, 4-6, 6-4, 2-6. Petrova fell in the second round at 2009 Family Circle Cup to Melinda Czink, 6-3, 4-6, 5-7. At the 2009 Porsche Tennis Grand Prix, Petrova was seeded sixth, but lost in the second round to Flavia Pennetta, 2-6, 2-6. She next went to the Rome Masters as eighth seed, where she had a first-round bye before defeating giant-killer Carla Suárez Navarro. In the third round, Petrova was ousted by María José Martínez Sánchez, 4-6, 7-6(5), 4-6.
How many more points did Melinda score in the last set than in the first set? How many sets did Aleksandra Wozniak beat Petrova by six points? How many times did Maria Jose score six points against Petrova? How many times did Petrova fail to score more than 4 points against an opponent in 2009? How many times did an opponent score six points against Petrova in 2009?