Citi Open 2021 - Đơn

Jannik Sinner
| runner = Mackenzie McDonald
| score = 7–5, 4–6, 7–5
| draw = 48 (6 / 4)
| seeds = 16
| type = singles doubles
| before_year = 2019
| before_name = Citi Open
}}

Nick Kyrgios là đương kim vô địch, nhưng thua ở vòng 1 trước Mackenzie McDonald.

Jannik Sinner là nhà vô địch, đánh bại McDonald trong trận chung kết, 7–5, 4–6, 7–5. Đây là danh hiệu ATP 500 đầu tiên của Sinner.

Hạt giống
Tất cả các hạt giống được miễn vào vòng 2.
Rafael Nadal (Vòng 3)
Félix Auger-Aliassime (Vòng 3)
Alex de Minaur (Vòng 2)
Grigor Dimitrov (Vòng 2)
Jannik Sinner (Vô địch)
Dan Evans (Vòng 2)
Cameron Norrie (Vòng 3)
Reilly Opelka (Vòng 3)

Alexander Bublik (Vòng 2)
Taylor Fritz (Vòng 2)
John Millman (Tứ kết)
Sebastian Korda (Vòng 3)
Benoît Paire (Vòng 2)
Lloyd Harris (Tứ kết)
Miomir Kecmanović (Vòng 2)
Frances Tiafoe (Vòng 2)
}}

Kết quả

Chung kết
Lloyd Harris
|RD1-score1-1=3
|RD1-score1-2=5
|RD1-score1-3=
|RD1-seed2=
|RD1-team2= Kei Nishikori
|RD1-score2-1=6
|RD1-score2-2=7
|RD1-score2-3=

|RD1-seed3=
|RD1-team3= Mackenzie McDonald
|RD1-score3-1=6
|RD1-score3-2=6
|RD1-score3-3=
|RD1-seed4=
|RD1-team4= Denis Kudla
|RD1-score4-1=3
|RD1-score4-2=2
|RD1-score4-3=

|RD1-seed5=5
|RD1-team5= Jannik Sinner
|RD1-score5-1=6
|RD1-score5-2=6
|RD1-score5-3=
|RD1-seed6=
|RD1-team6= Steve Johnson
|RD1-score6-1=4
|RD1-score6-2=2
|RD1-score6-3=

|RD1-seed7=11
|RD1-team7= John Millman
|RD1-score7-1=1
|RD1-score7-2=2
|RD1-score7-3=
|RD1-seed8=WC
|RD1-team8= Jenson Brooksby
|RD1-score8-1=6
|RD1-score8-2=6
|RD1-score8-3=

|RD2-seed1=
|RD2-team1= Kei Nishikori
|RD2-score1-1=4
|RD2-score1-2=6
|RD2-score1-3=5
|RD2-seed2=
|RD2-team2= Mackenzie McDonald
|RD2-score2-1=6
|RD2-score2-2=3
|RD2-score2-3=7

|RD2-seed3=5
|RD2-team3= Jannik Sinner
|RD2-score3-1=77
|RD2-score3-2=6
|RD2-score3-3=
|RD2-seed4=WC
|RD2-team4= Jenson Brooksby
|RD2-score4-1=62
|RD2-score4-2=1
|RD2-score4-3=

|RD3-seed1=
|RD3-team1= Mackenzie McDonald
|RD3-score1-1=5
|RD3-score1-2=6
|RD3-score1-3=5
|RD3-seed2=5
|RD3-team2= Jannik Sinner
|RD3-score2-1=7
|RD3-score2-2=4
|RD3-score2-3=7
}}

Nửa trên
Nhánh 1
J Sock
| RD1-score03-1=63
| RD1-score03-2=4
| RD1-score03-3=
| RD1-seed04=
| RD1-team04= Y Nishioka
| RD1-score04-1=77
| RD1-score04-2=0r
| RD1-score04-3=

| RD1-seed05=
| RD1-team05= T Sandgren
| RD1-score05-1=6
| RD1-score05-2=2
| RD1-score05-3=6
| RD1-seed06=
| RD1-team06= J Duckworth
| RD1-score06-1=3
| RD1-score06-2=6
| RD1-score06-3=2

| RD1-seed11=
| RD1-team11= K Nishikori
| RD1-score11-1=6
| RD1-score11-2=6
| RD1-score11-3=
| RD1-seed12=
| RD1-team12= S Querrey
| RD1-score12-1=4
| RD1-score12-2=3
| RD1-score12-3=

| RD1-seed13=
| RD1-team13= M Giron
| RD1-score13-1=4
| RD1-score13-2=6
| RD1-score13-3=77
| RD1-seed14=Q
| RD1-team14= I Marchenko
| RD1-score14-1=6
| RD1-score14-2=4
| RD1-score14-3=61

| RD2-seed01=1/WC
| RD2-team01= R Nadal
| RD2-score01-1=6
| RD2-score01-2=4
| RD2-score01-3=77
| RD2-seed02=WC
| RD2-team02= J Sock
| RD2-score02-1=2
| RD2-score02-2=6
| RD2-score02-3=61

| RD2-seed03=
| RD2-team03= T Sandgren
| RD2-score03-1=4
| RD2-score03-2=0r
| RD2-score03-3=
| RD2-seed04=14
| RD2-team04= L Harris
| RD2-score04-1=6
| RD2-score04-2=1
| RD2-score04-3=

| RD2-seed05=9
| RD2-team05= A Bublik
| RD2-score05-1=2
| RD2-score05-2=5
| RD2-score05-3=
| RD2-seed06=
| RD2-team06= K Nishikori
| RD2-score06-1=6
| RD2-score06-2=7
| RD2-score06-3=

| RD2-seed07=
| RD2-team07= M Giron
| RD2-score07-1=4
| RD2-score07-2=3
| RD2-score07-3=
| RD2-seed08=7
| RD2-team08= C Norrie
| RD2-score08-1=6
| RD2-score08-2=6
| RD2-score08-3=

| RD3-seed01=1/WC
| RD3-team01= R Nadal
| RD3-score01-1=4
| RD3-score01-2=6
| RD3-score01-3=4
| RD3-seed02=14
| RD3-team02= L Harris
| RD3-score02-1=6
| RD3-score02-2=1
| RD3-score02-3=6

| RD3-seed03=
| RD3-team03= K Nishikori
| RD3-score03-1=3
| RD3-score03-2=6
| RD3-score03-3=6
| RD3-seed04=7
| RD3-team04= C Norrie
| RD3-score04-1=6
| RD3-score04-2=3
| RD3-score04-3=3

| RD4-seed01=14
| RD4-team01= L Harris
| RD4-score01-1=3
| RD4-score01-2=5
| RD4-score01-3=
| RD4-seed02=
| RD4-team02= K Nishikori
| RD4-score02-1=6
| RD4-score02-2=7
| RD4-score02-3=
}}

Nhánh 2
E Gerasimov
| RD1-score03-1=5
| RD1-score03-2=4
| RD1-score03-3=
| RD1-seed04=
| RD1-team04= I Ivashka
| RD1-score04-1=7
| RD1-score04-2=6
| RD1-score04-3=

| RD1-seed05=
| RD1-team05= M McDonald
| RD1-score05-1=6
| RD1-score05-2=6
| RD1-score05-3=
| RD1-seed06=
| RD1-team06= N Kyrgios
| RD1-score06-1=4
| RD1-score06-2=4
| RD1-score06-3=

| RD1-seed11=
| RD1-team11= D Kudla
| RD1-score11-1=6
| RD1-score11-2=65
| RD1-score11-3=6
| RD1-seed12=WC
| RD1-team12= F López
| RD1-score12-1=3
| RD1-score12-2=77
| RD1-score12-3=3

| RD1-seed13=WC
| RD1-team13= B Nakashima
| RD1-score13-1=6
| RD1-score13-2=6
| RD1-score13-3=
| RD1-seed14=
| RD1-team14= A Popyrin
| RD1-score14-1=3
| RD1-score14-2=3
| RD1-score14-3=

| RD2-seed01=4
| RD2-team01= G Dimitrov
| RD2-score01-1=2
| RD2-score01-2=64
| RD2-score01-3=
| RD2-seed02=
| RD2-team02= I Ivashka
| RD2-score02-1=6
| RD2-score02-2=77
| RD2-score02-3=

| RD2-seed03=
| RD2-team03= M McDonald
| RD2-score03-1=66
| RD2-score03-2=6
| RD2-score03-3=6
| RD2-seed04=13
| RD2-team04= B Paire
| RD2-score04-1=78
| RD2-score04-2=4
| RD2-score04-3=4

| RD2-seed05=10
| RD2-team05= T Fritz
| RD2-score05-1=4
| RD2-score05-2=2
| RD2-score05-3=
| RD2-seed06=
| RD2-team06= D Kudla
| RD2-score06-1=6
| RD2-score06-2=6
| RD2-score06-3=

| RD2-seed07=WC
| RD2-team07= B Nakashima
| RD2-score07-1=77
| RD2-score07-2=6
| RD2-score07-3=
| RD2-seed08=6
| RD2-team08= D Evans
| RD2-score08-1=61
| RD2-score08-2=0
| RD2-score08-3=

| RD3-seed01=
| RD3-team01= I Ivashka
| RD3-score01-1=4
| RD3-score01-2=4
| RD3-score01-3=
| RD3-seed02=
| RD3-team02= M McDonald
| RD3-score02-1=6
| RD3-score02-2=6
| RD3-score02-3=

| RD3-seed03=
| RD3-team03= D Kudla
| RD3-score03-1=3
| RD3-score03-2=77
| RD3-score03-3=6
| RD3-seed04=WC
| RD3-team04= B Nakashima
| RD3-score04-1=6
| RD3-score04-2=63
| RD3-score04-3=4

| RD4-seed01=
| RD4-team01= M McDonald
| RD4-score01-1=6
| RD4-score01-2=6
| RD4-score01-3=
| RD4-seed02=
| RD4-team02= D Kudla
| RD4-score02-1=3
| RD4-score02-2=2
| RD4-score02-3=
}}

Nửa dưới
Nhánh 3
P Gunneswaran
| RD1-score03-1=6
| RD1-score03-2=1
| RD1-score03-3=1
| RD1-seed04=
| RD1-team04= E Ruusuvuori
| RD1-score04-1=2
| RD1-score04-2=6
| RD1-score04-3=6

| RD1-seed05=Q
| RD1-team05= E Gómez
| RD1-score05-1=6
| RD1-score05-2=3
| RD1-score05-3=3
| RD1-seed06=
| RD1-team06= V Pospisil
| RD1-score06-1=4
| RD1-score06-2=6
| RD1-score06-3=6

| RD1-seed11=Q
| RD1-team11= M Krueger
| RD1-score11-1=64
| RD1-score11-2=2
| RD1-score11-3=
| RD1-seed12=
| RD1-team12= R Berankis
| RD1-score12-1=77
| RD1-score12-2=6
| RD1-score12-3=

| RD1-seed13=
| RD1-team13= S Johnson
| RD1-score13-1=6
| RD1-score13-2=77
| RD1-score13-3=
| RD1-seed14=Q
| RD1-team14= R Ramanathan
| RD1-score14-1=3
| RD1-score14-2=60
| RD1-score14-3=

| RD2-seed01=5
| RD2-team01= J Sinner
| RD2-score01-1=6
| RD2-score01-2=6
| RD2-score01-3=
| RD2-seed02=
| RD2-team02= E Ruusuvuori
| RD2-score02-1=2
| RD2-score02-2=4
| RD2-score02-3=

| RD2-seed03=
| RD2-team03= V Pospisil
| RD2-score03-1=5
| RD2-score03-2=4
| RD2-score03-3=
| RD2-seed04=12
| RD2-team04= S Korda
| RD2-score04-1=7
| RD2-score04-2=6
| RD2-score04-3=

| RD2-seed05=15
| RD2-team05= M Kecmanović
| RD2-score05-1=3
| RD2-score05-2=2
| RD2-score05-3=
| RD2-seed06=
| RD2-team06= R Berankis
| RD2-score06-1=6
| RD2-score06-2=6
| RD2-score06-3=

| RD2-seed07=
| RD2-team07= S Johnson
| RD2-score07-1=65
| RD2-score07-2=6
| RD2-score07-3=6
| RD2-seed08=3
| RD2-team08= A de Minaur
| RD2-score08-1=77
| RD2-score08-2=4
| RD2-score08-3=2

| RD3-seed01=5
| RD3-team01= J Sinner
| RD3-score01-1=77
| RD3-score01-2=77
| RD3-score01-3=
| RD3-seed02=12
| RD3-team02= S Korda
| RD3-score02-1=63
| RD3-score02-2=63
| RD3-score02-3=

| RD3-seed03=
| RD3-team03= R Berankis
| RD3-score03-1=2
| RD3-score03-2=1
| RD3-score03-3=
| RD3-seed04=
| RD3-team04= S Johnson
| RD3-score04-1=6
| RD3-score04-2=6
| RD3-score04-3=

| RD4-seed01=5
| RD4-team01= J Sinner
| RD4-score01-1=6
| RD4-score01-2=6
| RD4-score01-3=
| RD4-seed02=
| RD4-team02= S Johnson
| RD4-score02-1=4
| RD4-score02-2=2
| RD4-score02-3=
}}

Nhánh 4
T Paul
| RD1-score03-1=4
| RD1-score03-2=3
| RD1-score03-3=
| RD1-seed04=
| RD1-team04= DE Galán
| RD1-score04-1=6
| RD1-score04-2=6
| RD1-score04-3=

| RD1-seed05=Q
| RD1-team05= E Ymer
| RD1-score05-1=3
| RD1-score05-2=7
| RD1-score05-3=6
| RD1-seed06=
| RD1-team06= J Thompson
| RD1-score06-1=6
| RD1-score06-2=5
| RD1-score06-3=3

| RD1-seed11=
| RD1-team11= K Anderson
| RD1-score11-1=64
| RD1-score11-2=3
| RD1-score11-3=
| RD1-seed12=WC
| RD1-team12= J Brooksby
| RD1-score12-1=77
| RD1-score12-2=6
| RD1-score12-3=

| RD1-seed13=
| RD1-team13= Y Uchiyama
| RD1-score13-1=6
| RD1-score13-2=5
| RD1-score13-3=3
| RD1-seed14=
| RD1-team14= A Seppi
| RD1-score14-1=3
| RD1-score14-2=7
| RD1-score14-3=6

| RD2-seed01=8
| RD2-team01= R Opelka
| RD2-score01-1=77
| RD2-score01-2=6
| RD2-score01-3=
| RD2-seed02=
| RD2-team02= DE Galán
| RD2-score02-1=61
| RD2-score02-2=3
| RD2-score02-3=

| RD2-seed03=Q
| RD2-team03= E Ymer
| RD2-score03-1=2
| RD2-score03-2=68
| RD2-score03-3=
| RD2-seed04=11
| RD2-team04= J Millman
| RD2-score04-1=6
| RD2-score04-2=710
| RD2-score04-3=

| RD2-seed05=16
| RD2-team05= F Tiafoe
| RD2-score05-1=64
| RD2-score05-2=5
| RD2-score05-3=
| RD2-seed06=WC
| RD2-team06= J Brooksby
| RD2-score06-1=77
| RD2-score06-2=7
| RD2-score06-3=

| RD2-seed07=
| RD2-team07= A Seppi
| RD2-score07-1=6
| RD2-score07-2=2
| RD2-score07-3=2
| RD2-seed08=2
| RD2-team08= F Auger-Aliassime
| RD2-score08-1=2
| RD2-score08-2=6
| RD2-score08-3=6

| RD3-seed01=8
| RD3-team01= R Opelka
| RD3-score01-1=3
| RD3-score01-2=64
| RD3-score01-3=
| RD3-seed02=11
| RD3-team02= J Millman
| RD3-score02-1=6
| RD3-score02-2=77
| RD3-score02-3=

| RD3-seed03=WC
| RD3-team03= J Brooksby
| RD3-score03-1=6
| RD3-score03-2=6
| RD3-score03-3=
| RD3-seed04=2
| RD3-team04= F Auger-Aliassime
| RD3-score04-1=3
| RD3-score04-2=4
| RD3-score04-3=

| RD4-seed01=11
| RD4-team01= J Millman
| RD4-score01-1=1
| RD4-score01-2=2
| RD4-score01-3=
| RD4-seed02=WC
| RD4-team02= J Brooksby
| RD4-score02-1=6
| RD4-score02-2=6
| RD4-score02-3=
}}

Vòng loại
Hạt giống
Yasutaka Uchiyama (Vào vòng đấu chính)
Liam Broady (Vòng loại cuối cùng)
J.J. Wolf (Vòng loại cuối cùng)
Maxime Cressy (Vòng loại cuối cùng)
Evgeny Donskoy (Vòng 1)
Prajnesh Gunneswaran (Vượt qua vòng loại)
Illya Marchenko (Vượt qua vòng loại)
Jason Jung (Vòng 1)
Sebastian Ofner (Vòng loại cuối cùng)
Emilio Gómez (Vượt qua vòng loại)
Elias Ymer (Vượt qua vòng loại)
Mitchell Krueger (Vượt qua vòng loại)
}}

Vượt qua vòng loại
Ramkumar Ramanathan
Emilio Gómez
Elias Ymer
Illya Marchenko
Mitchell Krueger
Prajnesh Gunneswaran
}}

Kết quả vòng loại
Vòng loại thứ 1
Ramkumar Ramanathan
| RD1-score1-1=6
| RD1-score1-2=3
| RD1-score1-3=6
| RD1-seed2=Alt
| RD1-team2= Christopher Eubanks
| RD1-score2-1=4
| RD1-score2-2=6
| RD1-score2-3=3

| RD1-seed3=PR
| RD1-team3= Tatsuma Ito
| RD1-score3-1=64
| RD1-score3-2=2
| RD1-score3-3=
| RD1-seed4=9
| RD1-team4= Sebastian Ofner
| RD1-score4-1=77
| RD1-score4-2=6
| RD1-score4-3=

| RD2-seed1=Alt
| RD2-team1= Ramkumar Ramanathan
| RD2-score1-1=7
| RD2-score1-2=6
| RD2-score1-3=
| RD2-seed2=9
| RD2-team2= Sebastian Ofner
| RD2-score2-1=5
| RD2-score2-2=1
| RD2-score2-3=
}}

Vòng loại thứ 2
Liam Broady
| RD1-score1-1=6
| RD1-score1-2=2
| RD1-score1-3=6
| RD1-seed2=Alt
| RD1-team2= Mikael Torpegaard
| RD1-score2-1=4
| RD1-score2-2=6
| RD1-score2-3=3

| RD1-seed3=Alt
| RD1-team3= Matthew Ebden
| RD1-score3-1=3
| RD1-score3-2=1
| RD1-score3-3=
| RD1-seed4=10
| RD1-team4= Emilio Gómez
| RD1-score4-1=6
| RD1-score4-2=6
| RD1-score4-3=

| RD2-seed1=2
| RD2-team1= Liam Broady
| RD2-score1-1=4
| RD2-score1-2=60
| RD2-score1-3=
| RD2-seed2=10
| RD2-team2= Emilio Gómez
| RD2-score2-1=6
| RD2-score2-2=77
| RD2-score2-3=
}}

Vòng loại thứ 3
J.J. Wolf
| RD1-score1-1=65
| RD1-score1-2=77
| RD1-score1-3=6
| RD1-seed2=WC
| RD1-team2= Ulises Blanch
| RD1-score2-1=77
| RD1-score2-2=63
| RD1-score2-3=3

| RD1-seed3=&nbsp;
| RD1-team3= Bjorn Fratangelo
| RD1-score3-1=4
| RD1-score3-2=3
| RD1-score3-3=
| RD1-seed4=11
| RD1-team4= Elias Ymer
| RD1-score4-1=6
| RD1-score4-2=6
| RD1-score4-3=

| RD2-seed1=3/PR
| RD2-team1= J.J. Wolf
| RD2-score1-1=65
| RD2-score1-2=64
| RD2-score1-3=
| RD2-seed2=11
| RD2-team2= Elias Ymer
| RD2-score2-1=77
| RD2-score2-2=77
| RD2-score2-3=
}}

Vòng loại thứ 4
Maxime Cressy
| RD1-score1-1=6
| RD1-score1-2=7
| RD1-score1-3=
| RD1-seed2=
| RD1-team2= Michael Mmoh
| RD1-score2-1=2
| RD1-score2-2=5
| RD1-score2-3=

| RD1-seed3=WC
| RD1-team3= Ivo Karlović
| RD1-score3-1=3
| RD1-score3-2=712
| RD1-score3-3=3
| RD1-seed4=7
| RD1-team4= Illya Marchenko
| RD1-score4-1=6
| RD1-score4-2=610
| RD1-score4-3=6

| RD2-seed1=4
| RD2-team1= Maxime Cressy
| RD2-score1-1=5
| RD2-score1-2=77
| RD2-score1-3=3
| RD2-seed2=7
| RD2-team2= Illya Marchenko
| RD2-score2-1=7
| RD2-score2-2=64
| RD2-score2-3=6
}}

Vòng loại thứ 5
Evgeny Donskoy
| RD1-score1-1=65
| RD1-score1-2=4
| RD1-score1-3=
| RD1-seed2=Alt
| RD1-team2= Max Purcell
| RD1-score2-1=77
| RD1-score2-2=6
| RD1-score2-3=

| RD1-seed3=WC
| RD1-team3= Andrew Fenty
| RD1-score3-1=4
| RD1-score3-2=4
| RD1-score3-3=
| RD1-seed4=12
| RD1-team4= Mitchell Krueger
| RD1-score4-1=6
| RD1-score4-2=6
| RD1-score4-3=

| RD2-seed1=Alt
| RD2-team1= Max Purcell
| RD2-score1-1=6
| RD2-score1-2=3
| RD2-score1-3=2
| RD2-seed2=12
| RD2-team2= Mitchell Krueger
| RD2-score2-1=3
| RD2-score2-2=6
| RD2-score2-3=6
}}

Vòng loại thứ 6
Prajnesh Gunneswaran
| RD1-score1-1=6
| RD1-score1-2=6
| RD1-score1-3=
| RD1-seed2=WC
| RD1-team2= Luke Saville
| RD1-score2-1=2
| RD1-score2-2=2
| RD1-score2-3=

| RD1-seed3=&nbsp;
| RD1-team3= Go Soeda
| RD1-score3-1=6
| RD1-score3-2=62
| RD1-score3-3=6
| RD1-seed4=8
| RD1-team4= Jason Jung
| RD1-score4-1=4
| RD1-score4-2=77
| RD1-score4-3=4

| RD2-seed1=6
| RD2-team1= Prajnesh Gunneswaran
| RD2-score1-1=6
| RD2-score1-2=6
| RD2-score1-3=
| RD2-seed2=&nbsp;
| RD2-team2= Go Soeda
| RD2-score2-1=3
| RD2-score2-2=1
| RD2-score2-3=
}}

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