Seeds • 1 Rankings as of 31 May 2021.
Other entrants The following players received a wildcard into the singles main draw: •
Jana Fett •
Ana Konjuh •
Tena Lukas •
Tereza Mrdeža The following players received entry using protected rankings: •
Alexandra Dulgheru •
Priscilla Hon The following players entered the singles main draw through qualification: •
Alexandra Cadanțu •
Dalma Gálfi •
Ekaterine Gorgodze •
Lulu Sun Withdrawals ;Before the tournament •
Eugenie Bouchard → replaced by
Ysaline Bonaventure •
Elisabetta Cocciaretto → replaced by
Irina Bara •
Varvara Gracheva → replaced by
Renata Zarazúa •
Anna Kalinskaya → replaced by
Olga Govortsova •
Danka Kovinić → replaced by
Priscilla Hon •
Bernarda Pera → replaced by
Usue Maitane Arconada •
Rebecca Peterson → replaced by
Katarina Zavatska •
Sara Sorribes Tormo → replaced by
Katarzyna Kawa •
Patricia Maria Țig → replaced by
Barbara Haas •
Zhu Lin → replaced by
Claire Liu •
Tamara Zidanšek → replaced by
Nuria Párrizas Díaz Retirements •
Greet Minnen •
Katarina Zavatska == Doubles entrants ==