2021 Ostrava Challenger – Singles

Aslan Karatsev was the defending champion but chose not to defend his title.

Singles
2021 Ostrava Challenger
Champion	Benjamin Bonzi
Runner-up	Renzo Olivo
Score	6–4, 6–4

Main article: 2021 Ostrava Challenger

Benjamin Bonzi won the title after defeating Renzo Olivo 6–4, 6–4 in the final.

Seeds

1. Grégoire Barrère (second round)
2. Thiago Seyboth Wild (first round)
3. Benjamin Bonzi (champion)
4. Arthur Rinderknech (semifinals, retired)
5. Marc Polmans (quarterfinals)
6. Maxime Cressy (first round)
7. Alejandro Tabilo (second round)
8. Mohamed Safwat (first round)

Draw

Key

• Q = Qualifier
• WC = Wild card
• LL = Lucky loser
• Alt = Alternate
• SE = Special exempt
• PR = Protected ranking
• ITF = ITF entry
• JE = Junior exempt
• w/o = Walkover
• r = Retired
• d = Defaulted
• SR = Special ranking

Finals

	Semifinals							Final
		Renzo Olivo	5
	4	Arthur Rinderknech	4r
									Renzo Olivo	4	4
								3	Benjamin Bonzi	6	6
	3	Benjamin Bonzi	6	4	77
		Elias Ymer	3	6	65

Top half

	First round							Second round							Quarterfinals							Semifinals
	1	G Barrère	711	7
	Q	O Otte	69	5				1	G Barrère	6	4	3
		Z Kolář	6	4	2				TM Etcheverry	3	6	6
		TM Etcheverry	1	6	6											TM Etcheverry	4	4
	Q	L Miedler	3	6	4											R Olivo	6	6
		R Olivo	6	3	6				R Olivo	6	6
		R Haase	2	6	4			7	A Tabilo	2	3
	7	A Tabilo	6	4	6																		R Olivo	5
	4	A Rinderknech	6	6																		4	A Rinderknech	4r
		M Bourgue	4	0				4	A Rinderknech	7	6
		B Schnur	6	1	6				B Schnur	5	4
	Alt	MT Barrios Vera	2	6	1										4	A Rinderknech	3	6	6
		P Polansky	3	5											Q	L Klein	6	3	4
	Q	L Klein	6	7				Q	L Klein	77	4	6
		L Rosol	64	6	7				L Rosol	62	6	2
	8	M Safwat	77	2	5

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	M Polmans	6	6
		B Kavčič	3	3				5	M Polmans	6	6
		D Istomin	0	6	6				D Istomin	3	0
		L Lacko	6	1	4										5	M Polmans	4	2
		C Lestienne	2	0											3	B Bonzi	6	6
	WC	J Lehečka	6	6				WC	J Lehečka	3	4
		R Safiullin	2	1				3	B Bonzi	6	6
	3	B Bonzi	6	6																		3	B Bonzi	6	4	77
	6	M Cressy	6	65	4																		E Ymer	3	6	65
		E Ymer	3	77	6				E Ymer	6	6
	WC	P Rikl	4	2					S Stakhovsky	1	2
		S Stakhovsky	6	6												E Ymer	7	6
		S Báez	6	6											Q	A Molčan	5	3
	WC	Martin Krumich	2	2					S Báez	6	1	2r
	Q	A Molčan	6	6				Q	A Molčan	4	6	4
	2	T Seyboth Wild	1	4

External links

• Main draw
• Qualifying draw