2021 Hamburg European Open – Men's singles

Andrey Rublev was the defending champion,^[1] but chose to not defend his title as he and other Russian Olympic athletes were sent to Yuzhno-Sakhalinsk for training sessions.^[2]

Men's singles
2021 Hamburg European Open
Champion	Pablo Carreño Busta
Runner-up	Filip Krajinović
Score	6–2, 6–4
Draw	28 (6Q / 4WC)
Seeds	8

Main article: 2021 Hamburg European Open

Pablo Carreño Busta won his maiden ATP Tour 500 singles title, defeating Filip Krajinović in the final, 6–2, 6–4.

Seeds

The top four seeds received a bye into the second round.

1. Stefanos Tsitsipas (quarterfinals)
2. Pablo Carreño Busta (champion)
3. Nikoloz Basilashvili (quarterfinals)
4. Albert Ramos Viñolas (second round)
5. Dušan Lajović (quarterfinals)
6. Filip Krajinović (final)
7. Jan-Lennard Struff (first round)
8. Benoît Paire (quarterfinals)

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
	6	Filip Krajinović	6	6
		Laslo Đere	4	2
								6	Filip Krajinović	2	4
								2	Pablo Carreño Busta	6	6
		Federico Delbonis	62	3
	2	Pablo Carreño Busta	77	6

Top half

	First round							Second round							Quarterfinals							Semifinals
								1/WC	S Tsitsipas	77	6
	Q	M Marterer	62	6	64				D Koepfer	62	3
		D Koepfer	77	2	77										1/WC	S Tsitsipas	6	1	3
		J Munar	65	4											6	F Krajinović	3	6	6
	WC	P Kohlschreiber	77	6				WC	P Kohlschreiber	5	6	3
	WC	D Altmaier	3	77	1			6	F Krajinović	7	4	6
	6	F Krajinović	6	63	6																	6	F Krajinović	6	6
																							L Đere	4	2
								3	N Basilashvili	w/o
		C Moutet	1	2				LL	S Báez
	LL	S Báez	6	6											3	N Basilashvili	2	2
	WC	N Kuhn	6	1	2											L Đere	6	6
	Q	T Seyboth Wild	1	6	6			Q	T Seyboth Wild	61	1
		L Đere	6	7					L Đere	77	6
	7	J-L Struff	4	5

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	B Paire	6
		R Berankis	6r					8	B Paire	7	710
	Q	JP Varillas	6	6				Q	JP Varillas	5	68
	LL	S Nagal	0	4											8	B Paire	6	69	4
		F Delbonis	6	5	6											F Delbonis	4	711	6
	Q	Zh Zhang	1	7	4				F Delbonis	6	77
								4	A Ramos Viñolas	3	64
																							F Delbonis	62	3
	5	D Lajović	6	6																		2	P Carreño Busta	77	6
		L Pouille	4	4				5	D Lajović	6	62	6
		G Mager	6	4	63			Q	A Molčan	4	77	3
	Q	A Molčan	4	6	77										5	D Lajović	64	3
	Q	C Taberner	6	3	6										2	P Carreño Busta	77	6
		F López	4	6	3			Q	C Taberner	5	3
								2	P Carreño Busta	7	6

Qualifying

Seeds

1. Carlos Taberner (qualified)
2. Thiago Seyboth Wild (qualified)
3. Jozef Kovalík (first round)
4. Damir Džumhur (first round)
5. Christopher O'Connell (qualifying competition)
6. Juan Pablo Varillas (qualified)
7. Sumit Nagal (qualifying competition; Lucky loser)
8. Oscar Otte (first round)
9. Alex Molčan (qualified)
10. Sebastián Báez (qualifying competition; Lucky loser)
11. Alessandro Giannessi (qualifying competition)
12. Danilo Petrović (first round)

Qualifiers

1. Carlos Taberner
2. Thiago Seyboth Wild
3. Zhang Zhizhen
4. Maximilian Marterer
5. Alex Molčan
6. Juan Pablo Varillas

Lucky losers

1. Sumit Nagal
2. Sebastián Báez

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Carlos Taberner	6	6
	WC	Niklas Guttau	1	2
								1	Carlos Taberner	2	77	6
									Daniel Masur	6	65	4
		Daniel Masur	2	6	6
	12	Danilo Petrović	6	4	3

Second qualifier

	First round							Qualifying competition
	2	Thiago Seyboth Wild	6	6
	WC	Mats Rosenkranz	3	1
								2	Thiago Seyboth Wild	6	7
									Steven Diez	3	5
		Steven Diez	6	6
	8	Oscar Otte	4	4

Third qualifier

	First round							Qualifying competition
	3	Jozef Kovalík	4	4
		Zhang Zhizhen	6	6
									Zhang Zhizhen	6	6
								7	Sumit Nagal	4	2
	WC	Lewie Lane	3	1
	7	Sumit Nagal	6	6

Fourth qualifier

	First round							Qualifying competition
	4	Damir Džumhur	7	2	3
		Maximilian Marterer	5	6	6
									Maximilian Marterer	3	6	7
								11	Alessandro Giannessi	6	3	5
		Tobias Kamke	3	4
	11	Alessandro Giannessi	6	6

Fifth qualifier

	First round							Qualifying competition
	5	Christopher O'Connell	6	6
		Ernests Gulbis	3	0
								5	Christopher O'Connell	3	7	3
								9	Alex Molčan	6	5	6
		Filip Horanský	65	2
	9	Alex Molčan	77	6

Sixth qualifier

	First round							Qualifying competition
	6	Juan Pablo Varillas	7	6
		Jonáš Forejtek	5	2
								6	Juan Pablo Varillas	6	3	77
								10	Sebastián Báez	2	6	60
		Rudolf Molleker	5	2
	10	Sebastián Báez	7	6