[citation needed] Fręch started 2018 season in Auckland where she lost in qualifying (in the first round) to Sachia Vickery, in straight sets.

She beat Miyu Kato, Sofya Zhuk and Kayla Day, and became one of the 12 qualifiers, making her main-draw debut at the Grand Slam championship.

[citation needed] At the end of January, Fręch played at the $60k Andrézieux-Bouthéon event where she defeated Conny Perrin in three sets, Chloé Paquet in two and Vitalia Diatchenko y retirement.

In February, she started at the Hungarian Ladies Open where she came through the qualifying competition by defeating Çağla Büyükakçay in three, and Anna Blinkova in straight sets.

[4] She qualified for the Indian Wells Open, registering a first-round win over Zheng Saisai,[5] before losing to top seed Karolína Plíšková.

[6] At Indian Wells, entering into the main draw as a lucky loser,[7] Fręch defeated Mayar Sherif in the first round then lost in to 30th seed Markéta Vondroušová.

[10][11] Fręch entered the Indian Wells Open as a lucky loser, and won her third match at this tournament defeating Maryna Zanevska,[12] before losing to fourth seed Ons Jabeur.

[13] At the Miami Open, she entered directly into the second round of the main draw, again as a lucky loser, after the late withdrawal of 26th seed Zhang Shuai.

[14] She defeated wildcard player Erika Andreeva to reach the third round at a WTA 1000-level event for the first time in her career,[15] where she lost to Varvara Gracheva.

[27] She reached a historic first all-Polish WTA Tour final in the Open Era after 16 years old wildcard Laura Samson's retirement.

[29][30] On her debut at the Cincinnati Open where she qualified for the main draw, she recorded her first win over Marie Bouzková[31][32] before losing in the second round to Olympic champion, Zheng Qinwen.