On 24 February 2020, she achieved a career-high singles ranking of world No.

She made her WTA Tour main-draw debut at the 2018 Japan Open, after receiving a wildcard for the women's doubles tournament, partnering Hiroko Kuwata.

At the 2019 Kunming Open, as a part of the ITF Circuit, Muramatsu recorded one of her biggest victory defeating top 100 Zhu Lin in the second round.

[1] She qualified for the main draw of the 2020 Thailand Open in Hua Hin but lost to Barbara Haas.

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