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Singles
2021 Croatia Open Umag
Final
Champion	Carlos Alcaraz
Runner-up	Richard Gasquet
Score	6–2, 6–2
Details
Draw	28 (4 Q / 3 WC )
Seeds	8
Events
Singles Doubles
← 2019 · Croatia Open Umag · 2022 →

Carlos Alcaraz defeated Richard Gasquet in the final, 6–2, 6–2 to win the singles tennis title at the 2021 Croatia Open. It was his first ATP Tour title. With the victory, Alcaraz became the youngest player to win an ATP Tour title since Kei Nishikori at the 2008 Delray Beach International Tennis Championships.

Dušan Lajović was the reigning champion from when the tournament was last held in 2019, but lost to Daniel Altmaier in the quarterfinals.

Seeds

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

1. Albert Ramos Viñolas (semifinals)
2. Dušan Lajović (quarterfinals)
3. Filip Krajinović (quarterfinals)
4. Richard Gasquet (final)
5. Aljaž Bedene (first round)
6. Jaume Munar (first round)
7. Carlos Alcaraz (champion)
8. Gianluca Mager (second 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
	1	Albert Ramos Viñolas	2	6
	7	Carlos Alcaraz	6	7
								7	Carlos Alcaraz	6	6
								4	Richard Gasquet	2	2
	4	Richard Gasquet	7	3	6
	Q	Daniel Altmaier	6	6	3

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	A Ramos Viñolas	7	6
	Q	A Collarini	3	2				WC	D Ajduković	5	4
	WC	D Ajduković	6	6											1	A Ramos Viñolas	6	6
		C Taberner	6	6												S Travaglia	2	1
	WC	N Serdarušić	2	2					C Taberner	4	3
		S Travaglia	6	7					S Travaglia	6	6
	6	J Munar	3	6																		1	A Ramos Viñolas	2	6
																						7	C Alcaraz	6	7
								3	F Krajinović	6	6
	WC	H Rune	6	3	2				R Albot	4	2
		R Albot	1	6	6										3	F Krajinović	6	6	1
	LL	R Olivo	6	2	6										7	C Alcaraz	7	2	6
		A Martin	1	6	7				A Martin	3	1
		L Pouille	6	2	2			7	C Alcaraz	6	6
	7	C Alcaraz	3	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	A Bedene	1	4
		M Cecchinato	6	6					M Cecchinato	3	1
		D Džumhur	6	6					D Džumhur	6	6
	Q	F Horanský	4	3												D Džumhur	3	6
	Q	A Giannessi	7	7											4	R Gasquet	6	7
		J Veselý	6	5				Q	A Giannessi	6	4
								4	R Gasquet	7	6
																						4	R Gasquet	7	3	6
	8	G Mager	0	6	6																	Q	D Altmaier	6	6	3
		P Martínez	6	3	3			8	G Mager	6	1	5
	Q	D Altmaier	5	6	0			Q	D Altmaier	4	6	7
		C Moutet	7	1	0										Q	D Altmaier	6	6
		B Zapata Miralles	4	6	6										2	D Lajović	2	4
		P Cuevas	6	2	4				B Zapata Miralles	5	4
								2	D Lajović	7	6

Qualifying

Seeds

1. Daniel Altmaier (qualified)
2. Nikola Milojević (qualifying competition)
3. Blaž Rola (first round)
4. Alessandro Giannessi (qualified)
5. Filip Horanský (qualified)
6. Renzo Olivo (qualifying competition, lucky loser)
7. Thomas Fabbiano (first round)
8. Daniel Masur (first round)

Qualifiers

1. Daniel Altmaier
2. Filip Horanský
3. Andrea Collarini
4. Alessandro Giannessi

Lucky loser

1. Renzo Olivo

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Daniel Altmaier	2	6	6
	Alt	Flavio Cobolli	6	3	1
								1	Daniel Altmaier	3	6	6
								WC	Matija Pecotić	6	4	3
	WC	Matija Pecotić	7	6
	7	Thomas Fabbiano	5	2

Second qualifier

	First round							Qualifying competition
	2	Nikola Milojević	6	7
		Lukáš Rosol	4	5
								2	Nikola Milojević	2	2
								5	Filip Horanský	6	6
	WC	Hamad Međedović	4	7	1
	5	Filip Horanský	6	6	6

Third qualifier

	First round							Qualifying competition
	3	Blaž Rola	4	2
		Vitaliy Sachko	6	6
									Vitaliy Sachko	7	2	4
									Andrea Collarini	6	6	6
		Andrea Collarini	6	6
	8	Daniel Masur	1	1

Fourth qualifier

	First round							Qualifying competition
	4	Alessandro Giannessi	6	7
		Rudolf Molleker	3	5
								4	Alessandro Giannessi	7	6
								6	Renzo Olivo	6	1
	Alt	Nerman Fatić	3	1
	6	Renzo Olivo	6	6

References

• Main draw
• Qualifying draw

• 2021 ATP Tour
• Croatia Open
• 2021 in Croatian tennis