Answer
The answer is the 2009 US Open. Kateryna reached the quarterfinals by defeating 31st-seeded Anabel Medina Garrigues in the first round, 17th-seeded Amélie Mauresmo in the second round, 12th-seeded Agnieszka Radwańska in the third round and 10th-seeded Flavia Pennetta in the fourth round. She lost to third-seeded Dinara Safina in the quarterfinals.