Zheng Saisai or Zheng Sai-Sai (郑赛赛; born February 5, 1994) is a Chinese tennis player. Her highest WTA singles ranking is No. 60, which she reached in August 2016. Her career high in doubles is No. 15, achieved on July 11, 2016.

In 2009, Zheng was awarded a wildcard into a $10,000 ITF event in Shenzhen and won her first ITF title, defeating Sabina Sharipova in the final.

In 2010, Zheng achieved great success at the 2010 Summer Youth Olympics in Singapore, winning the silver medal in singles and the gold medal in doubles with Tang Haochen. Zheng played three $10,000 ITF events in 2010 and reached the final of each one. She won one title and finished with a year-end ranking of 661.

Despite failing to win a title in 2011, Zheng reached two finals at $25,000 ITF events and finished with a year-end ranking of 276.

After a solid start to the year, Zheng's first big breakthrough came at a $50,000 ITF event in Wenshan, where she reached the biggest final of her career without dropping a set. She lost the final to Hsieh Su-wei.

Zheng's success at the $50,000 level continued as she reached the quarterfinals in Gifu (losing to Kurumi Nara, whom she had beaten two times previously that year), the semifinals in Fukuoka (losing to Casey Dellacqua, whom she had beaten the week before in Gifu), and finally winning the biggest title of her career in Kurume.

Despite her success at the ITF level, Zheng did not enter the qualifying draw for the French Open, but she participated in doubles with Dominika Cibulková as her partner and reached the second round.

Zheng did, however, enter the qualifying draw at Wimbledon. She beat Teliana Pereira in three sets in the first round but lost her next match to Bibiane Schoofs.

Zheng failed to qualify for the main draw in Stanford, but was awarded a lucky loser and achieved her first ever WTA main-draw win against Ayumi Morita, who retired when Zheng was leading 4-2. Zheng lost in the second round to Sorana Cîrstea.

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