2021 Swedish Open – Men's singles

Nicolás Jarry was the reigning champion from when the tournament was last held in 2019, but chose to not defend his title.

Casper Ruud won the title, defeating Federico Coria in the final, 6–3, 6–3.

Seeds
The top four seeds receive a bye into the second round. • #🇳🇴 Casper Ruud (champion)

• # Cristian Garín (quarterfinals)

• #🇮🇹 Fabio Fognini (second round)

• #🇦🇺 John Millman (second round)

• #🇫🇷 Richard Gasquet (first round)

• #🇮🇹 Lorenzo Musetti (first round)

• #🇨🇿 Jiří Veselý (second round)

• #🇫🇮 Emil Ruusuvuori (second round)

Seeds
• # 🇫🇷 Arthur Rinderknech (qualified)

• # 🇸🇰 Andrej Martin (qualifying competition)

• # 🇦🇷 Francisco Cerúndolo (qualified)

• # 🇦🇹 Dennis Novak (qualified)

• # Henri Laaksonen (qualified)

• # Marc-Andrea Hüsler (qualifying competition)

• # Blaž Rola (qualifying competition)

• # 🇮🇹 Thomas Fabbiano (qualifying competition)

Qualifiers
• # 🇫🇷 Arthur Rinderknech

• # Henri Laaksonen

• # 🇦🇷 Francisco Cerúndolo

• # 🇦🇹 Dennis Novak