Ferrero's next tournament was the US Open, where he defeated Pablo Andújar in the first round, 1–6, 7–5, 5–7, 6–1, 6–3. In the second round, he defeated Frenchman Gaël Monfils in an electrifying five-set match, 7–6(7–5), 5–7, 6–7(5–7), 6–4, 6–4. His next opponent was Spain's Marcel Granollers, who retired in the second set; at the time of Granollers' retirement, Ferrero led the match 6–1, 4–3. In the fourth round, Ferrero lost to Janko Tipsarević, 5–7, 7–6(7–3), 5–7, 2–6. His next tournament was the 2011 China Open, where he lost in the quarterfinals to Jo-Wilfried Tsonga. He then played at the Shanghai Masters reaching the third round, falling to good friend David Ferrer 6–1, 5–7, 2–6 after having wasted three match points in the second set. His next tour stop was the Valencia Open, where he lost in the quarterfinals to Argentine player Juan Mónaco 3–6, 3–6. The final tournament of the year was the Paris Masters, where he lost in the first round to Frenchman Nicolas Mahut 2–6, 3–6.