2021 Swiss Open Gstaad – Singles

Singles
2021 Swiss Open Gstaad
Champion	Casper Ruud
Runner-up	Hugo Gaston
Score	6–3, 6–2
Draw	28 (4 Q / 3 WC )
Seeds	8

Main article: 2021 Swiss Open Gstaad

Casper Ruud defeated Hugo Gaston in the final, 6–3, 6–2, to win the men's singles tennis title at the 2021 Swiss Open.

Albert Ramos Viñolas was the reigning champion from when the tournament was last held in 2019, but chose to compete in Umag instead.

Seeds

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

1. Denis Shapovalov (second round)
2. Roberto Bautista Agut (second round)
3. Casper Ruud (champion)
4. Cristian Garín (quarterfinals)
5. Federico Delbonis (second round)
6. Benoît Paire (quarterfinals)
7. Laslo Đere (semifinals)
8. Feliciano López (second round)

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
	Q	Vít Kopřiva	3	0
	3	Casper Ruud	6	6
								3	Casper Ruud	6	6
									Hugo Gaston	3	2
		Hugo Gaston	3	6	6
	7	Laslo Đere	6	3	3

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	D Shapovalov	6	3	2
	WC	J Nikles	2	1				Q	V Kopřiva	2	6	6
	Q	V Kopřiva	6	6											Q	V Kopřiva	6	6
		M Ymer	4	6	6											M Ymer	1	0
	LL	E Couacaud	6	3	3				M Ymer	66	79	6
		M-A Hüsler	4	6	5r			8	F López	78	67	4
	8	F López	6	4	6																	Q	V Kopřiva	3	0
																						3	C Ruud	6	6
								3	C Ruud	6	77
	LL	K Żuk	4	4					D Novak	4	65
		D Novak	6	6											3	C Ruud	6	5	6
		T Griekspoor	7	4	77										6	B Paire	2	7	3
		JI Londero	5	6	61				T Griekspoor	4	0r
		J Kovalík	3	62				6	B Paire	6	0
	6	B Paire	6	77

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	F Delbonis	6	6
	WC	L Riedi	3	3				5	F Delbonis	0	77	63
		H Gaston	6	6					H Gaston	6	62	77
		JM Cerúndolo	4	2												H Gaston	6	1	713
		M Polmans	7	6											4	C Garín	4	6	611
	Q	S Ehrat	5	3					M Polmans	3	0
								4	C Garín	6	6
																							H Gaston	3	6	6
	7	L Đere	6	6																		7	L Đere	6	3	3
		T Seyboth Wild	4	3				7	L Đere	6	4	6
	Q	O Otte	63	1				Q	Z Bergs	2	6	2
	Q	Z Bergs	77	6											7	L Đere	6	65	6
		A Rinderknech	6	6												A Rinderknech	4	77	4
	WC	D Stricker	4	4					A Rinderknech	6	6
								2	R Bautista Agut	2	4

Qualifying

Seeds

1. Oscar Otte (qualified)
2. Kacper Żuk (qualifying competition, lucky loser)
3. Enzo Couacaud (qualifying competition, lucky loser)
4. Steven Diez (qualifying competition)
5. Ernests Gulbis (first round)
6. Maximilian Marterer (first round)
7. Aleksandar Vukic (first round)
8. Roberto Marcora (qualifying competition)

Qualifiers

1. Oscar Otte
2. Sandro Ehrat
3. Vít Kopřiva
4. Zizou Bergs

Lucky losers

1. Kacper Żuk
2. Enzo Couacaud

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Oscar Otte	6	6
		Andrea Pellegrino	2	4
								1	Oscar Otte	6	6
								8	Roberto Marcora	4	3
	Alt	Gonzalo Escobar	6	4	66
	8	Roberto Marcora	1	6	78

Second qualifier

	First round							Qualifying competition
	2	Kacper Żuk	6	3	6
	Alt	Andrea Vavassori	3	6	2
								2	Kacper Żuk	6	4	2
								WC	Sandro Ehrat	2	6	6
	WC	Sandro Ehrat	6	6
	5	Ernests Gulbis	3	4

Third qualifier

	First round							Qualifying competition
	3	Enzo Couacaud	6	6
		Pedro Sakamoto	1	3
								3	Enzo Couacaud	6	65	4
									Vít Kopřiva	2	77	6
		Vít Kopřiva	6	6
	6	Maximilian Marterer	2	3

Fourth qualifier

	First round							Qualifying competition
	4	Steven Diez	6	6
	WC	Damien Wenger	2	4
								4	Steven Diez	65	4
									Zizou Bergs	77	6
		Zizou Bergs	77	6
	7	Aleksandar Vukic	65	3

External links

• Main draw
• Qualifying draw