2021 Qatar ExxonMobil Open – Singles

Nikoloz Basilashvili defeated Roberto Bautista Agut in the final, 7–6(7–5), 6–2 to win the men's singles tennis title at the 2021 Qatar Open. Basilashvili saved a match point against Roger Federer in the quarterfinals.

Andrey Rublev was the defending champion, but lost in the semifinals to Bautista Agut.

This tournament marked the return of former world No. 1 Federer to the tour for the first time since the 2020 Australian Open, due to a pair of knee surgeries since then. His defeat to Basilashvili marked a record-extending 24th and final loss from match point up in his career.

Seeds
The top four seeds received a bye into the second round. • # 🇦🇹 Dominic Thiem (quarterfinals)

• # Roger Federer (quarterfinals)

• # 🇷🇺 Andrey Rublev (semifinals)

• # 🇨🇦 Denis Shapovalov (quarterfinals)

• # 🇪🇸 Roberto Bautista Agut (final)

• # 🇧🇪 David Goffin (second round)

• # Stan Wawrinka (first round)

• # Borna Ćorić (withdrew)

Seeds
• # Lloyd Harris (qualified)

• # 🇸🇰 Norbert Gombos (qualifying competition, lucky loser)

• # 🇦🇺 Christopher O'Connell (qualified)

• # Blaž Rola (qualified)

• # 🇮🇹 Thomas Fabbiano (qualifying competition)

• # 🇸🇰 Lukáš Lacko (qualifying competition)

• # 🇮🇳 Ramkumar Ramanathan (qualified)

• # 🇧🇷 Marcelo Melo (first round)

Qualifiers
• # Lloyd Harris

• # 🇮🇳 Ramkumar Ramanathan

• # 🇦🇺 Christopher O'Connell

• # Blaž Rola

Lucky loser
• # 🇸🇰 Norbert Gombos