She was runner-up in the girls' singles event of the
2010 Wimbledon Championships and reached a highest ranking of No. 5 on the
ITF Junior Circuit. Following her junior career, she chose to attend the
University of Tsukuba but decided in 2013 to take a leave of absence to focus on tennis and spend time training in the United States. She was coached by her father, Yasuhiko Ishizu. Ishizu participated at the
2013 Summer Universiade in
Kazan winning the gold medal in the
singles and the team competition. Her final appearance on the ITF Circuit took place in Hamamatsu, Japan in October 2015. ==ITF Circuit finals==