As a junior Tatsuzawa competed in the 2014 Summer Youth Olympics in Nanjing, she was 12th in the qualification round and so did not advance to the final.[2][3][4]
She became age eligible for senior competitions in 2015. In 2016 she was selected for the Asian Championships, being 15th in the All-Around, 30th with hoop, 16th with ball, 10th with clubs and 12th with ribbon.[5] A week later she made her World Cup debut in Tashkent, finishing 19th overall, 21st with hoop, 21st with ball, 18th with clubs and 16th with ribbon.[6]
In 2017 she took part in the World Cup in Pesaro, being 21st in the All-Around, 19th with hoop, 21st with ball, 20th with clubs and 20th with ribbon.[7] In May she was in Sofia, taking 19th place in the All-Around, 27th with hoop, 22nd with ball, 21st with clubs and 14th with ribbon.[8] In July she helped AEON win the Japanese Club Championships.[9] A month later she competed in the Summer Universiade in Taipei, there she was 6th in the All-Around, 4th with hoop, 5th with clubs and won bronze with ribbon behind Yulia Bravikova and Ekaterina Selezneva.[10][11] In October she was crowned national champion at the Japanese Championships.[12]
In 2019 Tatsuzawa was selected for the Asian Championships in Pattaya, winning bronze in teams along Aino Yamada, Ryoko Inomata and Ruriko Shibayama.[13]
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Japan