2021 ATP Lyon Open – Singles
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Benoît Paire was the defending champion from when the event was last held in 2019, but chose to participate in Geneva instead.
Stefanos Tsitsipas won the title, defeating Cameron Norrie in the final 6–3, 6–3.
Seeds
The top four seeds received a bye into the second round.
- Austria Dominic Thiem (second round)
- Greece Stefanos Tsitsipas (champion)
- Argentina Diego Schwartzman (second round)
- Belgium David Goffin (second round)
- France Gaël Monfils (second round)
- Italy Jannik Sinner (second round)
- Canada Félix Auger-Aliassime (first round)
- Russia Karen Khachanov (semifinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Finals
| Semifinals | Final | ||||||||||||
| United Kingdom Cameron Norrie | 6 | 6 | |||||||||||
| 8 | Russia Karen Khachanov | 1 | 1 | ||||||||||
| United Kingdom Cameron Norrie | 3 | 3 | |||||||||||
| 2/WC | Greece Stefanos Tsitsipas | 6 | 6 | ||||||||||
| Alt | Italy Lorenzo Musetti | 6 | 3 | 0 | |||||||||
| 2/WC | Greece Stefanos Tsitsipas | 4 | 6 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | Austria D Thiem | 3 | 2 | ||||||||||||||||||||||||
| France C Moutet | 5 | 3 | United Kingdom C Norrie | 6 | 6 | ||||||||||||||||||||||
| United Kingdom C Norrie | 7 | 6 | United Kingdom C Norrie | 6 | 3 | 6 | |||||||||||||||||||||
| LL | France A Rinderknech | 6 | 64 | 6 | LL | France A Rinderknech | 3 | 6 | 3 | ||||||||||||||||||
| Q | Sweden M Ymer | 3 | 77 | 2 | LL | France A Rinderknech | 67 | 6 | 7 | ||||||||||||||||||
| Russia A Karatsev | 6 | 3 | 4 | 6 | Italy J Sinner | 79 | 2 | 5 | |||||||||||||||||||
| 6 | Italy J Sinner | 0 | 6 | 6 | United Kingdom C Norrie | 6 | 6 | ||||||||||||||||||||
| 8 | Russia K Khachanov | 1 | 1 | ||||||||||||||||||||||||
| 3 | Argentina D Schwartzman | 3 | 5 | ||||||||||||||||||||||||
| France R Gasquet | 5 | 6 | 6 | France R Gasquet | 6 | 7 | |||||||||||||||||||||
| Q | France G Barrère | 7 | 4 | 3 | France R Gasquet | 1 | 63 | ||||||||||||||||||||
| Q | Portugal J Sousa | 3 | 68 | 8 | Russia K Khachanov | 6 | 77 | ||||||||||||||||||||
| Q | Poland K Majchrzak | 6 | 710 | Q | Poland K Majchrzak | 64 | 3 | ||||||||||||||||||||
| WC | France B Bonzi | 1 | 6 | 64 | 8 | Russia K Khachanov | 77 | 6 | |||||||||||||||||||
| 8 | Russia K Khachanov | 6 | 4 | 77 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | Canada F Auger-Aliassime | 63 | 6 | 5 | |||||||||||||||||||||||
| Alt | Italy L Musetti | 77 | 3 | 7 | Alt | Italy L Musetti | 6 | 1 | 6 | ||||||||||||||||||
| France P-H Herbert | 65 | 4 | United States S Korda | 3 | 6 | 4 | |||||||||||||||||||||
| United States S Korda | 77 | 6 | Alt | Italy L Musetti | 6 | 77 | |||||||||||||||||||||
| Slovenia A Bedene | 6 | 6 | Slovenia A Bedene | 3 | 62 | ||||||||||||||||||||||
| France G Simon | 2 | 3 | Slovenia A Bedene | 77 | 6 | ||||||||||||||||||||||
| 4 | Belgium D Goffin | 64 | 3 | ||||||||||||||||||||||||
| Alt | Italy L Musetti | 6 | 3 | 0 | |||||||||||||||||||||||
| 5 | France G Monfils | 7 | 6 | 2/WC | Greece S Tsitsipas | 4 | 6 | 6 | |||||||||||||||||||
| LL | Brazil T Seyboth Wild | 5 | 4 | 5 | France G Monfils | 6 | 3 | 62 | |||||||||||||||||||
| Japan Y Nishioka | 3 | 6 | 6 | Japan Y Nishioka | 4 | 6 | 77 | ||||||||||||||||||||
| France U Humbert | 6 | 3 | 4 | Japan Y Nishioka | 3 | 4 | |||||||||||||||||||||
| United States T Paul | 6 | 6 | 2/WC | Greece S Tsitsipas | 6 | 6 | |||||||||||||||||||||
| France J-W Tsonga | 3 | 3 | United States T Paul | 1 | 4 | ||||||||||||||||||||||
| 2/WC | Greece S Tsitsipas | 6 | 6 |
Qualifying
Seeds
- Italy Lorenzo Musetti (moved to the main draw)
- Sweden Mikael Ymer (qualified)
- Portugal João Sousa (qualified)
- France Grégoire Barrère (qualified)
- France Arthur Rinderknech (qualifying competition, lucky loser)
- Brazil Thiago Seyboth Wild (qualifying competition, lucky loser)
- Poland Kamil Majchrzak (qualified)
- France Antoine Hoang (qualifying competition)
Qualifiers
Lucky losers
Qualifying draw
First qualifier
| First round | Qualifying competition | ||||||||||||
| Alt | Canada Peter Polansky | 3 | 4 | ||||||||||
| Italy Alessandro Giannessi | 6 | 6 | |||||||||||
| Italy Alessandro Giannessi | 4 | 3 | |||||||||||
| 7 | Poland Kamil Majchrzak | 6 | 6 | ||||||||||
| United Kingdom Liam Broady | 6 | 62 | 4 | ||||||||||
| 7 | Poland Kamil Majchrzak | 4 | 77 | 6 |
Second qualifier
| First round | Qualifying competition | ||||||||||||
| 2 | Sweden Mikael Ymer | 6 | 1 | 6 | |||||||||
| Slovakia Martin Kližan | 3 | 6 | 4 | ||||||||||
| 2 | Sweden Mikael Ymer | 6 | 4 | 6 | |||||||||
| 6 | Brazil Thiago Seyboth Wild | 4 | 6 | 1 | |||||||||
| WC | France Kyrian Jacquet | 1 | 4 | ||||||||||
| 6 | Brazil Thiago Seyboth Wild | 6 | 6 |
Third qualifier
| First round | Qualifying competition | ||||||||||||
| 3 | Portugal João Sousa | 6 | 6 | ||||||||||
| Alt | Italy Roberto Marcora | 3 | 4 | ||||||||||
| 3 | Portugal João Sousa | 6 | 3 | 6 | |||||||||
| 5 | France Arthur Rinderknech | 4 | 6 | 3 | |||||||||
| Alt | Belgium Kimmer Coppejans | 5 | 6 | 62 | |||||||||
| 5 | France Arthur Rinderknech | 7 | 3 | 77 |
Fourth qualifier
| First round | Qualifying competition | ||||||||||||
| 4 | France Grégoire Barrère | 6 | 6 | ||||||||||
| Russia Evgeny Donskoy | 2 | 3 | |||||||||||
| 4 | France Grégoire Barrère | 6 | 65 | 6 | |||||||||
| 8 | France Antoine Hoang | 3 | 77 | 1 | |||||||||
| Japan Go Soeda | 1 | 1 | |||||||||||
| 8 | France Antoine Hoang | 6 | 6 |