Chang Kai-chen (Chinese: 張凱貞; pinyin: Zhāng Kǎizhēn; Taiwanese Mandarin: [tsáŋ kʰài tsə́n]; born January 13, 1991), also known as Kelly Chang, is a Taiwanese former professional tennis player.
Her father is Chang Chin-lai and mother is Jun Yu-mei; she has two older brothers, Yao-lun and Yao-chung (both play tennis). Born and raised in Taiwan, an hour from Taipei, Chang splits training between Taiwan and Delray Beach, Florida (International Tennis Academy). She started playing tennis at age six when introduced to sport by brothers at local tennis club. She is an aggressive baseliner whose favorite shot is backhand, her favorite surface is hardcourt.
She qualified for the 2009 US Open, where she beat 25th seed Kaia Kanepi 6–0, 2–6, 6–2 in her first-round match. At the 2009 Pan Pacific Open, Chang defeated world No. 1, Dinara Safina, 7–6, 4–6, 7–5 in her second-round match.
In July 2010, she reached her career-high singles ranking of world No. 82. In February 2013, she peaked at No. 65 in the WTA doubles rankings.
Playing for Chinese Taipei Fed Cup team, Chang has a win–loss record of 10–8.
