2021 IBG Prague Open – Singles

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

Singles
2021 IBG Prague Open
Champion	Franco Agamenone
Runner-up	Ryan Peniston
Score	6–3, 6–1

Main article: 2021 IBG Prague Open

Franco Agamenone won the title after defeating Ryan Peniston 6–3, 6–1 in the final.

Seeds

1. Evgeny Karlovskiy (quarterfinals)
2. Alexander Ritschard (second round)
3. Evgenii Tiurnev (first round)
4. Geoffrey Blancaneaux (second round)
5. Jonáš Forejtek (first round)
6. Michael Geerts (quarterfinals)
7. Filip Jianu (first round)
8. Miljan Zekić (first round, retired)

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
		Genaro Alberto Olivieri	1	5
		Ryan Peniston	6	7
									Ryan Peniston	3	1
									Franco Agamenone	6	6
		Franco Agamenone	6	6
		Igor Sijsling	3	0

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	E Karlovskiy	6	6
		H Casanova	2	3				1	E Karlovskiy	5	6	6
		R Molleker	7	4	6				R Molleker	7	4	2
	WC	A Paulson	5	6	1										1	E Karlovskiy	78	4	4
		Y-h Hsu	6	6												GA Olivieri	66	6	6
		A Vatutin	3	0					Y-h Hsu	3	4
		GA Olivieri	6	6					GA Olivieri	6	6
	5	J Forejtek	2	4																			GA Olivieri	1	5
	3	E Tiurnev	66	2																			R Peniston	6	7
		M Pecotić	78	6					M Pecotić	3	67
	Q	F Díaz Acosta	6	6				Q	F Díaz Acosta	6	79
	PR	M Donati	1	3											Q	F Díaz Acosta	3	1
	Q	Z Piros	4	3												R Peniston	6	6
	Q	U Ignatik	6	6				Q	U Ignatik	2	6	3
		R Peniston	6	4					R Peniston	6	2	6
	8	M Zekić	0	1r

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	6	M Geerts	6	6
	WC	Martin Krumich	2	4				6	M Geerts	6	6
		J Härteis	4	2				Q	A Rybakov	2	2
	Q	A Rybakov	6	6											6	M Geerts	7	5	3
		N Sánchez Izquierdo	3	3												F Agamenone	5	7	6
		F Agamenone	6	6					F Agamenone	7	6
		A Cazaux	4	66				4	G Blancaneaux	5	4
	4	G Blancaneaux	6	78																			F Agamenone	6	6
	7	FC Jianu	64	2																			I Sijsling	3	0
		M Pucinelli de Almeida	77	6					M Pucinelli de Almeida	2	6	2r
	WC	Daniel Siniakov	4	3					I Sijsling	6	2	3
		I Sijsling	6	6												I Sijsling	7	6
		K Uchida	6	3	6											K Uchida	5	3
		N Chappell	4	6	1				K Uchida	77	7
		R Ortega Olmedo	1	1				2	A Ritschard	64	5
	2	A Ritschard	6	6