[2] She made her WTA Tour main-draw debut at the French Open thanks to a wildcard, partnering Giulia Morlet; they were defeated by the 13th-seeded pair of Kiki Bertens and Johanna Larsson, in two sets in the first round.

[citation needed] She made her Grand Slam singles debut at the 2018 French Open, entering the qualifying event as a wildcard, where she upset No.

[9] Playing at the Mérida Open with Caty McNally, Parry won her maiden career doubles title, beating Wang Xinyu and Wu Fang-hsien in the final.

[10] Partnering with Anna Bondár, she won the doubles title at the Lausanne Open, defeating Amina Anshba and Anastasia Dețiuc in the final.

[12] Parry reached the third round of the Australian Open for the first time at this major, defeating 30th seed Wang Xinyu[13] and Kamilla Rakhimova,[14] before losing to Mirra Andreeva.

[citation needed] She reached her first grass-court semifinal at the Nottingham Open, losing to sixth seed Karolina Plíšková,[22] having overcome Cristina Bucșa,[23] Daria Saville[24] and Kimberly Birrell[25] on her way to the last four.

[28] She defeated qualifier Olivia Gadecki,[29] Jil Teichmann[30] and Chloe Paquet[31] to reach the semifinals at the Palermo Open, where she lost to top seed Zheng Qinwen.

[34] Seeded seventh, Parry made her third WTA semifinal of the year at the Japan Women's Open, recording wins over Erika Andreeva,[35] Greet Minnen[36] and Clara Tauson,[37] before losing to eventual champion Suzan Lamens.