Namigata is a professional tennis player since 2000. The right-handed could yet win a title on the WTA Tour. Better sees her balance on ITF level where already five singles and 14 doubles titles available to book with her.
2008 Namigata first played in the main draw of a Grand Slam tournament, she failed with her doubles partner Ayumi Morita at Wimbledon already in round one. With her compatriot she succeeded then but the biggest success of her career. In the WTA tournament in Bangkok, they reached the final against two Chinese Sun Tiantian and Yan Zi, but could not compete.
Since 2011 Namigata plays for Japan in the Fed Cup. Meanwhile, she denied in the team competition five encounters that they could always win.
Junri Namigata has completed the Waseda University with success and plays for the team of the company Livic Kita- Nihon Bussan (北 日本 物产).