2021 I.ČLTK Prague Open – Men's singles

The men's singles of the 2021 I.ČLTK Prague Open tournament was played on clay in Prague, Czech Republic.

Men's singles
2021 I.ČLTK Prague Open
Champion	Tallon Griekspoor
Runner-up	Oscar Otte
Score	5–7, 6–4, 6–4

Stan Wawrinka was the defending champion^[1] but chose not to partake in this edition.

Tallon Griekspoor won the title after defeating Oscar Otte 5–7, 6–4, 6–4 in the final.

Seeds

1. Norbert Gombos (semifinals)
2. Yūichi Sugita (first round, retired)
3. Andrej Martin (second round)
4. Dennis Novak (first round)
5. Denis Kudla (first round)
6. Kamil Majchrzak (first round)
7. Peter Gojowczyk (first round)
8. Sumit Nagal (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
	1	Norbert Gombos	65	3
		Tallon Griekspoor	77	6
									Tallon Griekspoor	5	6	6
									Oscar Otte	7	4	4
	WC	Michael Vrbenský	3	3
		Oscar Otte	6	6

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	N Gombos	66	6	6
		H Laaksonen	78	4	3			1	N Gombos	6	61	6
	Q	K Żuk	77	2	7			Q	K Żuk	3	77	3
		M Vilella Martínez	65	6	5										1	N Gombos	6	6
		D Popko	3	4											8	S Nagal	4	2
	Q	S Stakhovsky	6	6				Q	S Stakhovsky	6	1	4
	Q	Z Kolář	2	4				8	S Nagal	4	6	6
	8	S Nagal	6	6																		1	N Gombos	65	3
	4	D Novak	4	61																			T Griekspoor	77	6
	SE	R Olivo	6	77				SE	R Olivo	3	63
		L Rosol	3	0					T Griekspoor	6	77
		T Griekspoor	6	6												T Griekspoor	6	6
		R Marcora	64	2												F Ferreira Silva	2	4
		M Polmans	77	6					M Polmans	2	6	4
		F Ferreira Silva	6	65	6				F Ferreira Silva	6	3	6
	6	K Majchrzak	4	77	1

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	D Kudla	1	4
		Y Maden	6	6					Y Maden	6	4	1
	Q	V Kopřiva	6	64	78			Q	V Kopřiva	4	6	6
		I Marchenko	2	77	66										Q	V Kopřiva	1	4
	WC	M Vrbenský	77	6											WC	M Vrbenský	6	6
		S Ofner	64	3				WC	M Vrbenský	6	1	6
	WC	A Paulson	3	3				3	A Martin	4	6	4
	3	A Martin	6	6																		WC	M Vrbenský	3	3
	7	P Gojowczyk	3	1																			O Otte	6	6
		O Otte	6	6					O Otte	6	3	6
	WC	J Lehečka	4	6	77			WC	J Lehečka	1	6	3
		R Safiullin	6	3	64											O Otte	6	7
		M Cressy	6	6												M Cressy	3	5
		M Safwat	2	2					M Cressy	6	7
		A Tabilo	7	4					A Tabilo	2	5
	2	Y Sugita	5	0r