2021 Kozerki Open

The 2021 Kozerki Open was a professional women's tennis tournament played on outdoor clay courts. It was the second edition of the tournament which was part of the 2021 ITF Women's World Tennis Tour. It took place in Grodzisk Mazowiecki, Poland between 26 July and 1 August 2021.

Seeds

 * 1 Rankings are as of 19 July 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇵🇱 Weronika Baszak
 * 🇵🇱 Ania Hertel
 * 🇧🇾 Anna Kubareva
 * 🇵🇱 Martyna Kubka

The following players received entry from the qualifying draw:
 * 🇦🇷 María Lourdes Carlé
 * 🇻🇪 Andrea Gámiz
 * Bárbara Gatica
 * 🇫🇷 Alice Ramé
 * 🇨🇿 Tereza Smitková
 * Daniela Vismane

The following players received entry as lucky losers:
 * 🇺🇿 Akgul Amanmuradova
 * 🇺🇸 Jessie Aney
 * 🇷🇺 Amina Anshba
 * 🇷🇺 Valeriia Olianovskaia

Singles

 * Ekaterine Gorgodze def. 🇫🇷 Chloé Paquet, 7–6(9–7), 0–6, 6–4

Doubles

 * Bárbara Gatica / 🇧🇷 Rebeca Pereira def. 🇰🇷 Jang Su-jeong / Lee Ya-hsuan, 6–3, 6–1