23rd, she upset 16th seed Yanina Wickmayer in the third round, but fell to fourth seed Jelena Janković in the fourth round. Hantuchová played two tournaments on grass. She was defeated by Samantha Stosur at the Eastbourne International and was then upset by Barbora Záhlavová-Strýcová at Wimbledon. To start off the US Open Series, Hantuchová lost in the opening-round to sixth seed Shahar Pe'er at the Stanford Classic. At the San Diego Open, she upset sixth seed Marion Bartoli in the first round, saving three match points. She then beat Zheng Jie and Alisa Kleybanova to advance to the semifinals, where she fell to Agnieszka Radwańska in straight sets. Hantuchová then fell in the first rounds of the Cincinnati Masters, and the Rogers Cup to eventual semifinalist Anastasia Pavlyuchenkova and 15th seed Flavia Pennetta, respectively. At the Pilot Pen Tennis, she fell to Dinara Safina. As the 24th seed, Hantuchová defeated Dinara Safina and Vania King at the US Open, before falling to 12th seed Elena Dementieva in the third round. Hantuchová fell in the early rounds in both the Pan Pacific Open in Tokyo, Japan and the China Open. At the Generali Ladies Linz, Hantuchová was upset by Patty Schnyder in the quarterfinals. At the Luxembourg Open, she lost again in the early rounds to Angelique Kerber in three sets. Hantuchová received a wildcard to the Tournament of Champions in Bali. She upset Yanina Wickmayer in straight sets, but fell to Alisa Kleybanova in the semifinals. She also lost the third-place match to Kimiko Date-Krumm. Hantuchová finished outside the top 20 for the third consecutive year at No. 30, with a win–loss record of 35–25. She was 3–5 versus top-10 players, with losses to Dementieva, Venus Williams, Janković, Stosur, and Radwańska, and with victories over Dementieva and Janković (twice). 2011: Fifth WTA title Hantuchová withdrew from her first tournament of the year at the Brisbane International due to a left Achilles strain. She competed next at the Sydney International, but suffered a loss to María José Martínez Sánchez in the first round. At the Australian Open, she was the 28th seed, but lost in the first round to Regina Kulikova in three sets. This is the first time Hantuchová had lost in the first round of the Australian Open, except her first appearance. She then played at the Pattaya Open, where she defeated Kurumi Nara, Kimiko Date-Krumm, and Akgul