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Men's singles
2021 Kremlin Cup
Final
Champion	Aslan Karatsev
Runner-up	Marin Čilić
Score	6–2, 6–4
Details
Draw	28 (4 Q / 3 WC )
Seeds	8
Events
Singles men women Doubles men women
← 2019 · Kremlin Cup · 2022 →

Andrey Rublev was the reigning champion from when the tournament was last held in 2019, but lost to Adrian Mannarino in the second round in a rematch of the 2019 final.

Aslan Karatsev won the title, defeating Marin Čilić in the final, 6–2, 6–4.

Seeds

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

1. Andrey Rublev (second round)
2. Aslan Karatsev (champion)
3. Karen Khachanov (semifinals)
4. Filip Krajinović (second round)
5. Alexander Bublik (first round)
6. Marin Čilić (final)
7. Ilya Ivashka (withdrew)
8. Laslo Đere (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
	LL	Ričardas Berankis	3	4
	6	Marin Čilić	6	6
								6	Marin Čilić	2	4
								2	Aslan Karatsev	6	6
	3	Karen Khachanov	6	1
	2	Aslan Karatsev	7	6

Top half

	First round							Second round							Quarterfinals							Semifinals
								1	A Rublev	7	6	3
	WC	R Safiullin	6	6	4				A Mannarino	5	7	6
		A Mannarino	1	7	6											A Mannarino	2	6
		F Coria	6	5	6										LL	R Berankis	6	7
	WC	A Kachmazov	2	7	2				F Coria	2	1
	WC	E Donskoy	1	3				LL	R Berankis	6	6
	LL	R Berankis	6	6																		LL	R Berankis	3	4
																						6	M Čilić	6	6
								4	F Krajinović	3	4
	PR	G Pella	2	0					P Martínez	6	6
		P Martínez	6	0												P Martínez	1	2
		T Paul	7	7											6	M Čilić	6	6
		M Ymer	6	5					T Paul	5	3
	Q	D Džumhur	7	1	1			6	M Čilić	7	6
	6	M Čilić	6	6	6

Bottom half

	First round							Second round							Quarterfinals							Semifinals
	5	A Bublik	4	3
	Q	I Marchenko	6	6				Q	I Marchenko	1	7	4
		J Millman	6	6	6				J Millman	6	5	6
		B Bonzi	7	4	3											J Millman	5	6
		J Duckworth	3	7	6										3	K Khachanov	7	7
	Q	B Gojo	6	5	2				J Duckworth	6	3	1
								3	K Khachanov	3	6	6
																						3	K Khachanov	6	1
	8	L Đere	7	5	3																	2	A Karatsev	7	6
	PR	G Simon	6	7	6			PR	G Simon	6	6
		M McDonald	6	6					M McDonald	3	2
		Y Nishioka	3	4											PR	G Simon	4	3
		M Kecmanović	3	6	4										2	A Karatsev	6	6
	Q	E Gerasimov	6	1	6			Q	E Gerasimov	4	3
								2	A Karatsev	6	6

Qualifying

Seeds

1. Egor Gerasimov (qualified)
2. Ričardas Berankis (qualifying competition, lucky loser)
3. Radu Albot (first round)
4. Damir Džumhur (qualified)
5. Jurij Rodionov (qualifying competition)
6. Zdeněk Kolář (qualifying competition)
7. Marc Polmans (first round)
8. Elias Ymer (qualifying competition)

Qualifiers

1. Egor Gerasimov
2. Borna Gojo
3. Illya Marchenko
4. Damir Džumhur

Lucky loser

1. Ričardas Berankis

Qualifying draw

First qualifier

	First round							Qualifying competition
	1	Egor Gerasimov	6	6
		Ramkumar Ramanathan	3	4
								1	Egor Gerasimov	6	1	6
								8	Elias Ymer	4	6	2
	Alt	Pavel Kotov	2	3
	8	Elias Ymer	6	6

Second qualifier

	First round							Qualifying competition
	2	Ričardas Berankis	6	6
		Dmitry Popko	4	1
								2	Ričardas Berankis	6	5	4
									Borna Gojo	4	7	6
		Borna Gojo	7	6
	7	Marc Polmans	6	2

Third qualifier

	First round							Qualifying competition
	3	Radu Albot	6	3
		Illya Marchenko	7	6
									Illya Marchenko	6	6
								5	Jurij Rodionov	4	1
	PR	Denis Istomin	4	2
	5	Jurij Rodionov	6	6

Fourth qualifier

	First round							Qualifying competition
	4	Damir Džumhur	6	6	6
	WC	Maxim Zhukov	7	0	4
								4	Damir Džumhur	7	6
								6	Zdeněk Kolář	5	3
	WC	Yaroslav Demin	4	2
	6	Zdeněk Kolář	6	6

References

1. "Birthday Boy Rublev Prevails At Home In Moscow". atptour.com. 20 October 2019.

External links

• Main draw
• Qualifying draw

• 2021 ATP Tour
• Kremlin Cup