Chang Kai-chen (Chinese: 張凱貞; 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. At the 2009 Toray Pan Pacific Open, Chang defeated world no. 1 Dinara Safina, 7–6, 4–6, 7–5, in her second-round match.
Playing for Taiwan at the Fed Cup, Chang has a win–loss record of 7–5.
Kai-chen is currently without a full-time coach. Her father is Chin Lai Chang and mother is Yu Mei Jun; two older brothers, Yao Lun and Yao Chung (both play tennis). Born and raised in Taiwan, an hour from Taipei; splits training between Taiwan and Delray Beach, Florida (International Tennis Academy). Started playing tennis at age 6 when introduced to sport by brothers at local tennis club. She is an aggressive baseliner whose favorite shot is backhand; favorite surface is hard court. Her ambition is to reach Top 10.