Nicole Vaidišová in the first round, Peng Shuai in the second, before falling to No. 4 seed Serena Williams in three sets. She also competed in the women's doubles with Virginie Razzano, where they lost in the first round. In New Haven, she was seeded seventh and again beat Vaidišová in the first round. Cornet followed it up by beating Katarina Srebotnik, and a win over second seeded Daniela Hantuchová in the quarterfinal. However, she lost in the semifinals to eventual champion Caroline Wozniacki. At the US Open, she was seeded 17th in the singles event, where she reached the third round with wins over Camille Pin and Bethanie Mattek-Sands in the first and second rounds respectively before losing to 4–6, 5–7 to Anna-Lena Grönefeld in the third. 2009: Singles career-high Cornet played at the Hopman Cup, and placed third in her group, partnering Gilles Simon. She defeated Hsieh Su-wei of Chinese Taipei and Italian Flavia Pennetta. She then lost to Russia's Dinara Safina, 3–6, 2–6. Cornet began the season at the Sydney International where she defeated seventh seed Nadia Petrova and Alisa Kleybanova before losing to second seed and eventual finalist Dinara Safina in the quarterfinals. Cornet entered the Australian Open as the 15th seed, easily winning her two matches. In the third round, she dropped a set against Daniela Hantuchová, but advanced regardless. In the fourth round, she held two match points against Safina, but was eventually ousted in three sets. This was her third loss to the Russian already that year. Cornet then took part in the Open GdF Suez in Paris. Seeded fifth, she defeated Latvian qualifier Anastasija Sevastova in the first round and went on to again defeat Hantuchová in three tight sets in the second round. She was then defeated by the No. 2 seed Jelena Janković in the quarterfinal. Despite having an impressive first month of the year, Cornet's results began to slide. She lost her two matches to Francesca Schiavone and Flavia Pennetta in the Fed Cup, playing for France. Her best result in her next seven tournaments were third round showings in Dubai and Miami. She would lose another two matches in the Fed Cup Play-offs, to Daniela Hantuchová and Dominika Cibulková. Cornet fell in the early rounds in both the French Open and Wimbledon, continuing a dismal 2009 tennis season. She was then defeated in the early rounds in Budapest