2021 Sparkassen Open – Singles

Thiago Monteiro was the defending champion^[1] but chose not to defend his title.

Singles
2021 Sparkassen Open
Champion	Daniel Altmaier
Runner-up	Henri Laaksonen
Score	6–1, 6–2

Main article: 2021 Sparkassen Open

Daniel Altmaier won the title after defeating Henri Laaksonen 6–1, 6–2 in the final.

Seeds

1. Benoît Paire (second round)
2. Ričardas Berankis (withdrew)
3. Yannick Hanfmann (second round)
4. Jozef Kovalík (quarterfinals)
5. Henri Laaksonen (final)
6. Tomáš Macháč (second round)
7. Sumit Nagal (second round)
8. Daniel Altmaier (champion)

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
		Vít Kopřiva	4	0
	5	Henri Laaksonen	6	6
								5	Henri Laaksonen	1	2
								8	Daniel Altmaier	6	6
	8	Daniel Altmaier	7	6
	WC	Marvin Möller	5	0

Top half

	First round							Second round							Quarterfinals							Semifinals
	1/WC	B Paire	6	2	7
		G Andreozzi	4	6	5			1/WC	B Paire	1	6	2
	Q	D Michalski	2	2					V Kopřiva	6	2	6
		V Kopřiva	6	6												V Kopřiva	3	6	7
		Z Bergs	6	6												Z Bergs	6	0	5
		M Marterer	2	1					Z Bergs	77	5	6
		K Coppejans	2	3				6	T Macháč	65	7	4
	6	T Macháč	6	6																			V Kopřiva	4	0
	4	J Kovalík	77	6																		5	H Laaksonen	6	6
		F Horanský	65	3				4	J Kovalík	6	7
		A Vukic	3	4				Alt	M Jaziri	1	5
	Alt	M Jaziri	6	6											4	J Kovalík	3	2
		N Kuhn	6	77											5	H Laaksonen	6	6
	Alt	M Zverev	2	64					N Kuhn	4	5
	Q	M Rosenkranz	3	2				5	H Laaksonen	6	7
	5	H Laaksonen	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	D Altmaier	6	7
		Z Kolář	2	5				8	D Altmaier	6	6
		M Vilella Martínez	3	6	6				M Vilella Martínez	3	2
	WC	R Molleker	6	4	3										8	D Altmaier	6	6
		E Ymer	6	7												E Ymer	3	3
		T Kamke	3	5					E Ymer	2	6	6
		S Diez	5	6	3			3	Y Hanfmann	6	3	2
	3	Y Hanfmann	7	2	6																	8	D Altmaier	7	6
	7	S Nagal	6	77																		WC	M Möller	5	0
		M Safwat	3	63				7	S Nagal	3	6	2
	WC	M Möller	7	6				WC	M Möller	6	1	6
		T Gabashvili	5	3											WC	M Möller	6	6
	Q	S Ehrat	65	6	6										LL	B Hassan	4	2
		M Moraing	77	4	4			Q	S Ehrat	6	3	4
	LL	B Hassan	6	79				LL	B Hassan	4	6	6
	Q	D Kelly	4	67