Paszek began her US Open series at the Rogers Cup. In the first round, she defeated Julia Görges. In the second round, she faced top seed Victoria Azarenka. Azarenka retired at 3–3 in the first set due to a left knee injury. In the third round, she beat Carla Suárez Navarro. In the quarterfinals, Paszek lost to fifth seed and eventual champion Petra Kvitová. In Cincinnati at the Western & Southern Open, Paszek was up against Sofia Arvidsson. Arvidsson won the first set 6–1. In the second set, Arvidsson was leading 2–1 before Paszek retired because of a migraine. Her last tournament before the US Open was the New Haven Open at Yale. She lost in the first round to Sloane Stephens. Seeded twenty-ninth at the US Open, Paszek was defeated in the first round by Olga Govortsova.