[2] She reached her first WTA 125 final at the Zavarovalnica Sava Ljubljana, but lost to Marina Bassols Ribera in straight sets.

She was the first Turkish woman to play in the main draw of the French Open since Çağla Büyükakçay and İpek Soylu in 2017.

[10] In September, Sönmez reached her first WTA Tour quarterfinal at the Jasmin Open, going through qualifying, and defeated Rebeka Masarova[11] and sixth seed Greet Minnen.

148, at the WTA 500 Pan Pacific Open, she qualified for the main draw and upset seventh seed Magdalena Fręch for her second top 30 win.

[23][24][25] Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup and Olympic Games are included in win–loss records.