Singles
2021 Sofia Open
Champion	Jannik Sinner
Runner-up	Gaël Monfils
Score	6–3, 6–4
Draw	28 (4 Q / 3 WC )
Seeds	8

Jannik Sinner was the defending champion and successfully defended his title, defeating Gaël Monfils in the final, 6–3, 6–4.^[1]

Seeds

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

Draw

Finals

	Semifinals							Final
	1	Jannik Sinner	6	7
	5	Filip Krajinović	3	5
								1	Jannik Sinner	6	6
								2	Gaël Monfils	3	4
		Marcos Giron	5	0
	2	Gaël Monfils	7	6

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	J Sinner	6	77
	Q	E Gerasimov	5	710	6			Q	E Gerasimov	2	63
		V Pospisil	7	68	3										1	J Sinner	77	6
		E Ruusuvuori	6	4	4											J Duckworth	64	4
		J Duckworth	3	6	6				J Duckworth	6	6
		B Paire	6	7					B Paire	4	4
	7	A Davidovich Fokina	4	5																		1	J Sinner	6	7
																						5	F Krajinović	3	5
								LL	K Majchrzak	7	6
	WC	D Kuzmanov	64	77	6			WC	D Kuzmanov	5	1
		L Musetti	77	63	3										LL	K Majchrzak	3	6	3
	Q	P Martínez	65	3											5	F Krajinović	6	4	6
		L Đere	77	6					L Đere	3	0
	WC	A Lazarov	0	3				5	F Krajinović	6	6
	5	F Krajinović	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	8	J Millman	6	6
		M Ymer	2	4				8	J Millman	5	77	6
	Q	A Seppi	4	2				Q	I Marchenko	7	60	3
	Q	I Marchenko	6	6											8	J Millman	4	2
		J Munar	77	1	4											M Giron	6	6
		M Giron	62	6	6				M Giron	77	77
								3	A de Minaur	65	62
																							M Giron	5	0
	6	A Mannarino	3	2																		2	G Monfils	7	6
		G Mager	6	6					G Mager	77	6
		M Kecmanović	79	6					M Kecmanović	63	3
	WC	A Andreev	67	4												G Mager	2	2
		I Ivashka	6	6											2	G Monfils	6	6
		P Andújar	4	3					I Ivashka
								2	G Monfils	w/o

Qualifying

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Pedro Martínez	7	6
	WC	Simon Anthony Ivanov	5	1
								1	Pedro Martínez	6	77
								6	Kamil Majchrzak	4	64
		Maxime Cressy	6	4	3
	6	Kamil Majchrzak	4	6	6

Second qualifier

	First round							Qualifying competition
	2	Marco Cecchinato	3	3
		Illya Marchenko	6	6
									Illya Marchenko	3	6	77
								7	Tomáš Macháč	6	3	62
		Kacper Żuk	4	2
	7	Tomáš Macháč	6	6

Third qualifier

	First round							Qualifying competition
	3	Andreas Seppi	77	6
		Cem İlkel	63	2
								3	Andreas Seppi	6	6
								WC	Alexander Donski	3	2
	WC	Alexander Donski	2	6	77
	8	Jurij Rodionov	6	1	64

Fourth qualifier

	First round							Qualifying competition
	4	Egor Gerasimov	6	77
		Evgeny Donskoy	3	64
								4	Egor Gerasimov	78	6
									Altuğ Çelikbilek	66	3
		Altuğ Çelikbilek	78	4	7
	5	Daniel Elahi Galán	66	6	5

References

External links

• Main draw
• Qualifying draw