Chang Kai-chen (traditional Chinese: 張凱貞; simplified Chinese: 张凯贞; pinyin: Zhāng Kǎizhēn; born January 13, 1991) is a professional Taiwanese tennis player.Her highest WTA singles ranking is no. 82, which she reached on July 5, 2010. Her career high in doubles is no. 65, which she reached on February 11, 2013.Chang was born in Taiwan and is a right-handed player. She qualified for the 2009 U.S. Open, where she beat 25th seed Kaia Kanepi, 6–0, 2–6, 6–2, in her first-round match.