2021 National Bank Open – Men's singles

Daniil Medvedev defeated Reilly Opelka in the final, 6–4, 6–3 to win the men's singles tennis title at the 2021 Canadian Open. It was his fourth ATP Masters 1000 title and 12th career title. Opelka was contesting his maiden Masters 1000 final.^[1]

Men's singles
2021 National Bank Open
Champion	Daniil Medvedev
Runner-up	Reilly Opelka
Score	6–4, 6–3
Draw	48 (6 Q / 3 WC )
Seeds	16

Main article: 2021 National Bank Open

Rafael Nadal was the two-time reigning champion from when the event was last held in 2019 and was vying to tie Ivan Lendl's record of six Canadian Open titles,^[2] but did not participate due to a foot injury.^[3]

Seeds

All seeds received a bye into the second round.

01.   Daniil Medvedev (champion)

02.   Rafael Nadal (withdrew due to left foot injury)

03.   Stefanos Tsitsipas (semifinals)

04.   Andrey Rublev (third round)

05.   Denis Shapovalov (second round)

06.   Casper Ruud (quarterfinals)

07.   Hubert Hurkacz (quarterfinals)

08.   Diego Schwartzman (third round)

09.   Félix Auger-Aliassime (second round)

10.   Roberto Bautista Agut (quarterfinals)

11.   Gaël Monfils (quarterfinals)

12.   Alex de Minaur (second round)

13.   Cristian Garín (second round)

14.   Grigor Dimitrov (second round)

15.   Aslan Karatsev (second round)

16.   Jannik Sinner (second round)

Click on the seed number of a player to go to their draw section.

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

	Quarterfinals							Semifinals							Final
	1	Daniil Medvedev	2	78	77
	7	Hubert Hurkacz	6	66	65
								1	Daniil Medvedev	6	6
									John Isner	2	2
		John Isner	77	6
	11	Gaël Monfils	65	4
															1	Daniil Medvedev	6	6
																Reilly Opelka	4	3
	6	Casper Ruud	1	4
	3	Stefanos Tsitsipas	6	6
								3	Stefanos Tsitsipas	77	64	4
									Reilly Opelka	62	77	6
	10	Roberto Bautista Agut	3	61
		Reilly Opelka	6	77

Top half

Section 1

	First round							Second round							Third round							Quarterfinals
								1	D Medvedev	4	6	6
		D Evans	4	4					A Bublik	6	3	4
		A Bublik	6	6											1	D Medvedev	6	6
	Q	J Duckworth	77	6											Q	J Duckworth	2	4
		T Fritz	62	3				Q	J Duckworth	6	6
								16	J Sinner	3	4
																						1	D Medvedev	2	78	77
																						7	H Hurkacz	6	66	65
								12	A de Minaur	1	1
	WC	J Brooksby	6	0	4				N Basilashvili	6	6
		N Basilashvili	2	6	6											N Basilashvili	79	4	4
		M Kecmanović	4	77	2										7	H Hurkacz	67	6	6
	PR	K Nishikori	6	65	6			PR	K Nishikori
								7	H Hurkacz	w/o

Section 2

	First round							Second round							Third round							Quarterfinals
								4	A Rublev	77	6
		J-L Struff	77	2	4				F Fognini	64	3
		F Fognini	62	6	6										4	A Rublev	5	65
		J Isner	6	6												J Isner	7	77
		A Davidovich Fokina	4	1					J Isner	4	6	6
								13	C Garín	6	3	4
																							J Isner	77	6
																						11	G Monfils	65	4
								11	G Monfils	3	6	6
		J Millman	6	77					J Millman	6	3	4
	Q	R Berankis	3	64											11	G Monfils	6	77
	Q	Y Nishioka	4	3											LL	F Tiafoe	1	62
	LL	F Tiafoe	6	6				LL	F Tiafoe	6	6
								5	D Shapovalov	1	4

Bottom half

Section 3

	First round							Second round							Third round							Quarterfinals
								6	C Ruud	6	3	6
		A Ramos Viñolas	2	6	3				M Čilić	3	6	3
		M Čilić	6	4	6										6	C Ruud	6	6
		D Lajović	3	6	6											D Lajović	4	3
	Q	E Ruusuvuori	6	3	3				D Lajović	7	6
								9	F Auger-Aliassime	5	4
																						6	C Ruud	1	4
																						3	S Tsitsipas	6	6
								15	A Karatsev	67	4
		C Norrie	4	7	4				K Khachanov	79	6
		K Khachanov	6	5	6											K Khachanov	3	2
		L Sonego	3	4											3	S Tsitsipas	6	6
		U Humbert	6	6					U Humbert	3	715	1
								3	S Tsitsipas	6	613	6

Section 4

	First round							Second round							Third round							Quarterfinals
								8	D Schwartzman	7	6
		B Paire	6	6					B Paire	5	1
	SE	M McDonald	3	4											8	D Schwartzman	3	6	5
	WC	V Pospisil	77	2	3										10	R Bautista Agut	6	3	7
	Q	T Paul	65	6	6			Q	T Paul	3	4
								10	R Bautista Agut	6	6
																						10	R Bautista Agut	3	61
																							R Opelka	6	77
								14	G Dimitrov	3	4
	WC	N Kyrgios	6	64	4				R Opelka	6	6
		R Opelka	4	77	6											R Opelka	4	78	77
		L Harris	6	6												L Harris	6	66	64
	Q	B Schnur	3	2					L Harris	6	6
								LL	F López	2	3

Qualifying

Seeds

1. Frances Tiafoe (qualifying competition, lucky loser)
2. Tommy Paul (qualified)
3. Yoshihito Nishioka (qualified)
4. Dominik Koepfer (first round)
5. Lorenzo Musetti (removed for exiting Covid-19 bubble)
6. Marcos Giron (first round)
7. Emil Ruusuvuori (qualified)
8. Alexei Popyrin (first round)
9. James Duckworth (qualified)
10. Ričardas Berankis (qualified)
11. Feliciano López (qualifying competition, lucky loser)
12. Benjamin Bonzi (first round)

Qualifiers

1. Emil Ruusuvuori
2. Tommy Paul
3. Yoshihito Nishioka
4. James Duckworth
5. Ričardas Berankis
6. Brayden Schnur

Lucky losers

1. Frances Tiafoe
2. Feliciano López

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Frances Tiafoe	6	0	6
		J. J. Wolf	2	6	4
								1	Frances Tiafoe	1	4
								7	Emil Ruusuvuori	6	6
	WC	Steven Diez	3	2
	7	Emil Ruusuvuori	6	6

Second qualifier

	First round							Qualifying competition
	2	Tommy Paul	77	6
	WC	Liam Draxl	60	4
								2	Tommy Paul	77	6
									Liam Broady	63	3
		Liam Broady	5	79	77
	8	Alexei Popyrin	7	67	62

Third qualifier

	First round							Qualifying competition
	3	Yoshihito Nishioka	77	6
		Michael Mmoh	65	2
								3	Yoshihito Nishioka	7	78
								11	Feliciano López	5	66
		Maxime Cressy	64	4
	11	Feliciano López	77	6

Fourth qualifier

	First round							Qualifying competition
	4	Dominik Koepfer	3	4
	WC	Peter Polansky	6	6
								WC	Peter Polansky	6	1	2
								9	James Duckworth	4	6	6
		Illya Marchenko	1	3
	9	James Duckworth	6	6

Fifth qualifier

	First round							Qualifying competition
	Alt	Max Purcell	62	77	64
		Emilio Gómez	77	62	77
									Emilio Gómez	4	5
								10	Ričardas Berankis	6	7
		Norbert Gombos	65	4
	10	Ričardas Berankis	77	6

Sixth qualifier

	First round							Qualifying competition
	6	Marcos Giron	2	3
	WC	Brayden Schnur	6	6
								WC	Brayden Schnur	79	6
									Daniel Elahi Galán	67	3
		Daniel Elahi Galán	6	2	6
	12	Benjamin Bonzi	3	6	2