2021 Upper Austria Ladies Linz – Singles

Alison Riske won the title, defeating Jaqueline Cristian in the final, 2–6, 6–2, 7–5.

Aryna Sabalenka was the defending champion, but she qualified to compete at the WTA Finals instead.

Seeds
The top four seeds received a bye into the second round. • #🇬🇧 Emma Raducanu (second round)

• #🇷🇴 Simona Halep (semifinals, withdrew)

• #🇺🇸 Danielle Collins (semifinals, retired due to shoulder injury)

• #🇷🇺 Veronika Kudermetova (quarterfinals)

• #🇷🇺 Ekaterina Alexandrova (first round)

• #🇷🇴 Sorana Cîrstea (withdrew)

• #🇮🇹 Jasmine Paolini (quarterfinals)

• #🇺🇸 Alison Riske (champion)

Seeds
• #🇷🇴 Jaqueline Cristian (qualifying competition, lucky loser)

• #🇨🇳 Wang Xinyu (qualified)

• #🇷🇴 Ana Bogdan (qualifying competition)

• #🇫🇷 Harmony Tan (qualified)

• #🇸🇰 Kristína Kučová (qualifying competition)

• #🇧🇬 Viktoriya Tomova (first round)

• #🇺🇦 Lesia Tsurenko (qualified)

• #🇷🇺 Kamilla Rakhimova (moved to main draw)

Qualifiers
• #🇺🇦 Lesia Tsurenko

• #🇨🇳 Wang Xinyu

• #🇺🇦 Kateryna Kozlova

• #🇫🇷 Harmony Tan

Lucky loser
• #🇷🇴 Jaqueline Cristian