Quần vợt tại Thế vận hội Mùa hè 2020 - Đơn nam

| runner =
| score = 6–3, 6–1
| quadrennial = yes
| type = mixed
}}

Nội dung đơn nam quần vợt Thế vận hội Mùa hè 2020 diễn ra từ ngày 24 tháng 7 đến ngày 1 tháng 8 năm 2021 tại Ariake Coliseum. Có tổng cộng 64 tay vợt từ 32 quốc gia tham gia tranh tài.

Alexander Zverev của Đức giành được huy chương vàng, đánh bại Karen Khachanov của Uỷ ban Olympic Nga trong trận chung kết, 6–3, 6–1. Zverev và Khacanov là nam tay vợt đầu tiên đoạt huy chương cho quốc gia ở môn quần vợt sau Tommy Haas và Yevgeny Kafelnikov tại kỳ Thế vận hội Sydney năm 2000. Zverev cũng trở thành nam tay vợt Đức đầu tiên đoạt huy chương vàng ở nội dung đơn nam môn quần vợt.

Trong trận huy chương đồng, Pablo Carreño Busta của Tây Ban Nha đánh bại Novak Djokovic của Serbia, 6–4, 6–7(6–8), 6–3 và trở thành nam tay vợt Tây Ban Nha đầu tiên đoạt huy chương ở nội dung đơn môn quần vợt sau Rafael Nadal tại kỳ Thế vận hội Bắc Kinh năm 2008.

Andy Murray là đương kim vô địch, nhưng rút lui trước trận đấu vòng 1 do căng cơ tứ đầu.

Tay vợt số 1 thế giới Novak Djokovic có cơ hội để hoàn thành phần thứ 4 của Slam Vàng, sau khi đã vô địch Úc Mở rộng, Pháp Mở rộng và Wimbledon trong năm 2021, cũng như đang có chuỗi 22 trận thắng kéo dài từ Belgrade Open, nhưng thua ở vòng bán kết trước Alexander Zverev.

Lịch thi đấu
Nội dung diễn ra trong 9 ngày, Thứ Bảy ngày 24 tháng 7 đến Chủ Nhật ngày 1 tháng 8.

Theo Giờ tiêu chuẩn Nhật Bản (UTC+9)

Hạt giống
(Bán kết, hạng 4)
(Tứ kết)
(Vòng 3)
(Vô địch, huy chương vàng)
(Vòng 1)
(Bán kết, huy chương đồng)
(Vòng 2)
(Vòng 3)
(Vòng 1)
(Vòng 1)
(Vòng 2)
(Chung kết, huy chương bạc)
(Vòng 2)
(Tứ kết)
(Vòng 3)
(Vòng 3)
}}

Kết quả

Chung kết

| RD1-score1-1=6
| RD1-score1-2=6
| RD1-score1-3=
| RD1-seed2=
| RD1-team2=
| RD1-score2-1=2
| RD1-score2-2=0
| RD1-score2-3=

| RD1-seed3=4
| RD1-team3=
| RD1-score3-1=6
| RD1-score3-2=6
| RD1-score3-3=
| RD1-seed4=
| RD1-team4=
| RD1-score4-1=4
| RD1-score4-2=1
| RD1-score4-3=

| RD1-seed5=12
| RD1-team5=
| RD1-score5-1=77
| RD1-score5-2=4
| RD1-score5-3=6
| RD1-seed6=14
| RD1-team6=
| RD1-score6-1=64
| RD1-score6-2=6
| RD1-score6-3=3

| RD1-seed7=6
| RD1-team7=
| RD1-score7-1=6
| RD1-score7-2=77
| RD1-score7-3=
| RD1-seed8=2
| RD1-team8=
| RD1-score8-1=2
| RD1-score8-2=65
| RD1-score8-3=

| RD2-seed1=1
| RD2-team1=
| RD2-score1-1=6
| RD2-score1-2=3
| RD2-score1-3=1
| RD2-seed2=4
| RD2-team2=
| RD2-score2-1=1
| RD2-score2-2=6
| RD2-score2-3=6

| RD2-seed3=12
| RD2-team3=
| RD2-score3-1=6
| RD2-score3-2=6
| RD2-score3-3=
| RD2-seed4=6
| RD2-team4=
| RD2-score4-1=3
| RD2-score4-2=3
| RD2-score4-3=

| RD3-seed1=4
| RD3-team1=
| RD3-score1-1=6
| RD3-score1-2=6
| RD3-score1-3=
| RD3-seed2=12
| RD3-team2=
| RD3-score2-1=3
| RD3-score2-2=1
| RD3-score2-3=

| 3rd-seed1=1
| 3rd-team1=
| 3rd-score1-1=4
| 3rd-score1-2=78
| 3rd-score1-3=3
| 3rd-seed2=6
| 3rd-team2=
| 3rd-score2-1=6
| 3rd-score2-2=66
| 3rd-score2-3=6
}}

Nửa trên
Nhánh 1

| RD1-score01-1=6
| RD1-score01-2=6
| RD1-score01-3=
| RD1-seed02=
| RD1-team02=
| RD1-score02-1=2
| RD1-score02-2=2
| RD1-score02-3=

| RD1-seed03=
| RD1-team03=
| RD1-score03-1=6
| RD1-score03-2=6
| RD1-score03-3=
| RD1-seed04=
| RD1-team04=
| RD1-score04-1=3
| RD1-score04-2=4
| RD1-score04-3=

| RD1-seed05=
| RD1-team05=
| RD1-score05-1=3
| RD1-score05-2=4
| RD1-score05-3=
| RD1-seed06=
| RD1-team06=
| RD1-score06-1=6
| RD1-score06-2=6
| RD1-score06-3=

| RD1-seed07=
| RD1-team07=
| RD1-score07-1=3
| RD1-score07-2=0
| RD1-score07-3=
| RD1-seed08=16
| RD1-team08=
| RD1-score08-1=6
| RD1-score08-2=6
| RD1-score08-3=

| RD1-seed09=10
| RD1-team09=
| RD1-score09-1=4
| RD1-score09-2=6
| RD1-score09-3=5
| RD1-seed10=
| RD1-team10=
| RD1-score10-1=6
| RD1-score10-2=4
| RD1-score10-3=7

| RD1-seed11=
| RD1-team11=
| RD1-score11-1=77
| RD1-score11-2=7
| RD1-score11-3=
| RD1-seed12=
| RD1-team12=
| RD1-score12-1=64
| RD1-score12-2=5
| RD1-score12-3=

| RD1-seed13=
| RD1-team13=
| RD1-score13-1=64
| RD1-score13-2=6
| RD1-score13-3=2
| RD1-seed14=
| RD1-team14=
| RD1-score14-1=77
| RD1-score14-2=3
| RD1-score14-3=6

| RD1-seed15=
| RD1-team15=
| RD1-score15-1=6
| RD1-score15-2=6
| RD1-score15-3=
| RD1-seed16=5
| RD1-team16=
| RD1-score16-1=3
| RD1-score16-2=4
| RD1-score16-3=

| RD2-seed01=1
| RD2-team01=
| RD2-score01-1=6
| RD2-score01-2=6
| RD2-score01-3=
| RD2-seed02=
| RD2-team02=
| RD2-score02-1=4
| RD2-score02-2=3
| RD2-score02-3=

| RD2-seed03=
| RD2-team03=
| RD2-score03-1=4
| RD2-score03-2=77
| RD2-score03-3=3
| RD2-seed04=16
| RD2-team04=
| RD2-score04-1=6
| RD2-score04-2=64
| RD2-score04-3=6

| RD2-seed05=
| RD2-team05=
| RD2-score05-1=64
| RD2-score05-2=6
| RD2-score05-3=6
| RD2-seed06=
| RD2-team06=
| RD2-score06-1=77
| RD2-score06-2=3
| RD2-score06-3=3

| RD2-seed07=
| RD2-team07=
| RD2-score07-1=65
| RD2-score07-2=6
| RD2-score07-3=1
| RD2-seed08=
| RD2-team08=
| RD2-score08-1=77
| RD2-score08-2=3
| RD2-score08-3=6

| RD3-seed01=1
| RD3-team01=
| RD3-score01-1=6
| RD3-score01-2=6
| RD3-score01-3=
| RD3-seed02=16
| RD3-team02=
| RD3-score02-1=3
| RD3-score02-2=1
| RD3-score02-3=

| RD3-seed03=
| RD3-team03=
| RD3-score03-1=67
| RD3-score03-2=0
| RD3-score03-3=
| RD3-seed04=
| RD3-team04=
| RD3-score04-1=79
| RD3-score04-2=6
| RD3-score04-3=

| RD4-seed01=1
| RD4-team01=
| RD4-score01-1=6
| RD4-score01-2=6
| RD4-score01-3=
| RD4-seed02=
| RD4-team02=
| RD4-score02-1=2
| RD4-score02-2=0
| RD4-score02-3=
}}

Nhánh 2

| RD1-score01-1=6
| RD1-score01-2=6
| RD1-score01-3=
| RD1-seed02=PR
| RD1-team02=
| RD1-score02-1=1
| RD1-score02-2=3
| RD1-score02-3=

| RD1-seed03=
| RD1-team03=
| RD1-score03-1=7
| RD1-score03-2=6
| RD1-score03-3=
| RD1-seed04=ITF
| RD1-team04=
| RD1-score04-1=5
| RD1-score04-2=1
| RD1-score04-3=

| RD1-seed05=
| RD1-team05=
| RD1-score05-1=6
| RD1-score05-2=6
| RD1-score05-3=
| RD1-seed06=
| RD1-team06=
| RD1-score06-1=3
| RD1-score06-2=2
| RD1-score06-3=

| RD1-seed07=
| RD1-team07=
| RD1-score07-1=6
| RD1-score07-2=66
| RD1-score07-3=63
| RD1-seed08=13
| RD1-team08=
| RD1-score08-1=4
| RD1-score08-2=78
| RD1-score08-3=77

| RD1-seed09=11
| RD1-team09=
| RD1-score09-1=6
| RD1-score09-2=6
| RD1-score09-3=
| RD1-seed10=
| RD1-team10=
| RD1-score10-1=3
| RD1-score10-2=2
| RD1-score10-3=

| RD1-seed11=
| RD1-team11=
| RD1-score11-1=6
| RD1-score11-2=77
| RD1-score11-3=
| RD1-seed12=ITF
| RD1-team12=
| RD1-score12-1=1
| RD1-score12-2=64
| RD1-score12-3=

| RD1-seed13=
| RD1-team13=
| RD1-score13-1=5
| RD1-score13-2=77
| RD1-score13-3=2
| RD1-seed14=ITF
| RD1-team14=
| RD1-score14-1=7
| RD1-score14-2=64
| RD1-score14-3=6

| RD1-seed15=Alt
| RD1-team15=
| RD1-score15-1=2
| RD1-score15-2=4
| RD1-score15-3=
| RD1-seed16=7
| RD1-team16=
| RD1-score16-1=6
| RD1-score16-2=6
| RD1-score16-3=

| RD2-seed01=4
| RD2-team01=
| RD2-score01-1=6
| RD2-score01-2=6
| RD2-score01-3=
| RD2-seed02=
| RD2-team02=
| RD2-score02-1=2
| RD2-score02-2=2
| RD2-score02-3=

| RD2-seed03=
| RD2-team03=
| RD2-score03-1=6
| RD2-score03-2=3
| RD2-score03-3=6
| RD2-seed04=13
| RD2-team04=
| RD2-score04-1=4
| RD2-score04-2=6
| RD2-score04-3=4

| RD2-seed05=11
| RD2-team05=
| RD2-score05-1=5
| RD2-score05-2=6
| RD2-score05-3=3
| RD2-seed06=
| RD2-team06=
| RD2-score06-1=7
| RD2-score06-2=4
| RD2-score06-3=6

| RD2-seed07=ITF
| RD2-team07=
| RD2-score07-1=7
| RD2-score07-2=3
| RD2-score07-3=6
| RD2-seed08=7
| RD2-team08=
| RD2-score08-1=5
| RD2-score08-2=6
| RD2-score08-3=3

| RD3-seed01=4
| RD3-team01=
| RD3-score01-1=6
| RD3-score01-2=77
| RD3-score01-3=
| RD3-seed02=
| RD3-team02=
| RD3-score02-1=4
| RD3-score02-2=65
| RD3-score02-3=

| RD3-seed03=
| RD3-team03=
| RD3-score03-1=77
| RD3-score03-2=4
| RD3-score03-3=6
| RD3-seed04=ITF
| RD3-team04=
| RD3-score04-1=63
| RD3-score04-2=6
| RD3-score04-3=1

| RD4-seed01=4
| RD4-team01=
| RD4-score01-1=6
| RD4-score01-2=6
| RD4-score01-3=
| RD4-seed02=
| RD4-team02=
| RD4-score02-1=4
| RD4-score02-2=1
| RD4-score02-3=
}}

Nửa dưới
Nhánh 3

| RD1-score01-1=7
| RD1-score01-2=6
| RD1-score01-3=
| RD1-seed02=ITF
| RD1-team02=
| RD1-score02-1=5
| RD1-score02-2=4
| RD1-score02-3=

| RD1-seed03=ITF
| RD1-team03=
| RD1-score03-1=65
| RD1-score03-2=6
| RD1-score03-3=6
| RD1-seed04=
| RD1-team04=
| RD1-score04-1=77
| RD1-score04-2= 4
| RD1-score04-3=4

| RD1-seed05=Alt
| RD1-team05=
| RD1-score05-1=7
| RD1-score05-2=3
| RD1-score05-3=64
| RD1-seed06=
| RD1-team06=
| RD1-score06-1=5
| RD1-score06-2=6
| RD1-score06-3=77

| RD1-seed07=
| RD1-team07=
| RD1-score07-1=6
| RD1-score07-2=1
| RD1-score07-3=2
| RD1-seed08=12
| RD1-team08=
| RD1-score08-1=3
| RD1-score08-2=6
| RD1-score08-3=6

| RD1-seed09=14
| RD1-team09=
| RD1-score09-1=77
| RD1-score09-2=6
| RD1-score09-3=
| RD1-seed10=
| RD1-team10=
| RD1-score10-1=63
| RD1-score10-2=1
| RD1-score10-3=

| RD1-seed11=
| RD1-team11=
| RD1-score11-1=4
| RD1-score11-2=2
| RD1-score11-3=
| RD1-seed12=
| RD1-team12=
| RD1-score12-1=6
| RD1-score12-2=6
| RD1-score12-3=

| RD1-seed13=
| RD1-team13=
| RD1-score13-1=3
| RD1-score13-2=2
| RD1-score13-3=
| RD1-seed14=
| RD1-team14=
| RD1-score14-1=6
| RD1-score14-2=6
| RD1-score14-3=

| RD1-seed15=PR
| RD1-team15=
| RD1-score15-1=3
| RD1-score15-2=6
| RD1-score15-3=3
| RD1-seed16=3
| RD1-team16=
| RD1-score16-1=6
| RD1-score16-2=3
| RD1-score16-3=6

| RD2-seed01=8
| RD2-team01=
| RD2-score01-1=6
| RD2-score01-2=7
| RD2-score01-3=
| RD2-seed02=ITF
| RD2-team02=
| RD2-score02-1=4
| RD2-score02-2=5
| RD2-score02-3=

| RD2-seed03=
| RD2-team03=
| RD2-score03-1=5
| RD2-score03-2=1
| RD2-score03-3=
| RD2-seed04=12
| RD2-team04=
| RD2-score04-1=7
| RD2-score04-2=6
| RD2-score04-3=

| RD2-seed05=14
| RD2-team05=
| RD2-score05-1=4
| RD2-score05-2=77
| RD2-score05-3=7
| RD2-seed06=
| RD2-team06=
| RD2-score06-1=6
| RD2-score06-2=65
| RD2-score06-3=5

| RD2-seed07=
| RD2-team07=
| RD2-score07-1=3
| RD2-score07-2=4
| RD2-score07-3=
| RD2-seed08=3
| RD2-team08=
| RD2-score08-1=6
| RD2-score08-2=6
| RD2-score08-3=

| RD3-seed01=8
| RD3-team01=
| RD3-score01-1=1
| RD3-score01-2=6
| RD3-score01-3=1
| RD3-seed02=12
| RD3-team02=
| RD3-score02-1=6
| RD3-score02-2=2
| RD3-score02-3=6

| RD3-seed03=14
| RD3-team03=
| RD3-score03-1=2
| RD3-score03-2=77
| RD3-score03-3=6
| RD3-seed04=3
| RD3-team04=
| RD3-score04-1=6
| RD3-score04-2=64
| RD3-score04-3=2

| RD4-seed01=12
| RD4-team01=
| RD4-score01-1=77
| RD4-score01-2=4
| RD4-score01-3=6
| RD4-seed02=14
| RD4-team02=
| RD4-score02-1=64
| RD4-score02-2=6
| RD4-score02-3=3
}}

Nhánh 4

| RD1-score01-1=7
| RD1-score01-2=6
| RD1-score01-3=
| RD1-seed02=
| RD1-team02=
| RD1-score02-1=5
| RD1-score02-2=2
| RD1-score02-3=

| RD1-seed03=
| RD1-team03=
| RD1-score03-1=65
| RD1-score03-2=7
| RD1-score03-3=79
| RD1-seed04=ITF
| RD1-team04=
| RD1-score04-1=77
| RD1-score04-2=5
| RD1-score04-3=67

| RD1-seed05=
| RD1-team05=
| RD1-score05-1=3
| RD1-score05-2=6
| RD1-score05-3=7
| RD1-seed06=
| RD1-team06=
| RD1-score06-1=6
| RD1-score06-2=3
| RD1-score06-3=5

| RD1-seed07=Alt
| RD1-team07=
| RD1-score07-1=6
| RD1-score07-2=77
| RD1-score07-3=
| RD1-seed08=9
| RD1-team08=
| RD1-score08-1=4
| RD1-score08-2=62
| RD1-score08-3=

| RD1-seed09=15
| RD1-team09=
| RD1-score09-1=6
| RD1-score09-2=6
| RD1-score09-3=
| RD1-seed10=
| RD1-team10=
| RD1-score10-1=4
| RD1-score10-2=3
| RD1-score10-3=

| RD1-seed11=
| RD1-team11=
| RD1-score11-1=4
| RD1-score11-2=6
| RD1-score11-3=6
| RD1-seed12=
| RD1-team12=
| RD1-score12-1=6
| RD1-score12-2=3
| RD1-score12-3=4

| RD1-seed13=ITF
| RD1-team13=
| RD1-score13-1=6
| RD1-score13-2=66
| RD1-score13-3=6
| RD1-seed14=ITF
| RD1-team14=
| RD1-score14-1=4
| RD1-score14-2=78
| RD1-score14-3=4

| RD1-seed15=
| RD1-team15=
| RD1-score15-1=4
| RD1-score15-2=68
| RD1-score15-3=
| RD1-seed16=2
| RD1-team16=
| RD1-score16-1=6
| RD1-score16-2=710
| RD1-score16-3=

| RD2-seed01=6
| RD2-team01=
| RD2-score01-1=5
| RD2-score01-2=6
| RD2-score01-3=6
| RD2-seed02=
| RD2-team02=
| RD2-score02-1=7
| RD2-score02-2=4
| RD2-score02-3=4

| RD2-seed03=
| RD2-team03=
| RD2-score03-1=6
| RD2-score03-2=6
| RD2-score03-3=
| RD2-seed04=Alt
| RD2-team04=
| RD2-score04-1=3
| RD2-score04-2=0
| RD2-score04-3=

| RD2-seed05=15
| RD2-team05=
| RD2-score05-1=6
| RD2-score05-2=77
| RD2-score05-3=
| RD2-seed06=
| RD2-team06=
| RD2-score06-1=4
| RD2-score06-2=64
| RD2-score06-3=

| RD2-seed07=ITF
| RD2-team07=
| RD2-score07-1=2
| RD2-score07-2=1
| RD2-score07-3=
| RD2-seed08=2
| RD2-team08=
| RD2-score08-1=6
| RD2-score08-2=6
| RD2-score08-3=

| RD3-seed01=6
| RD3-team01=
| RD3-score01-1=79
| RD3-score01-2=6
| RD3-score01-3=
| RD3-seed02=
| RD3-team02=
| RD3-score02-1=67
| RD3-score02-2=3
| RD3-score02-3=

| RD3-seed03=15
| RD3-team03=
| RD3-score03-1=2
| RD3-score03-2=6
| RD3-score03-3=2
| RD3-seed04=2
| RD3-team04=
| RD3-score04-1=6
| RD3-score04-2=3
| RD3-score04-3=6

| RD4-seed01=6
| RD4-team01=
| RD4-score01-1=6
| RD4-score01-2=77
| RD4-score01-3=
| RD4-seed02=2
| RD4-team02=
| RD4-score02-1=2
| RD4-score02-2=65
| RD4-score02-3=
}}

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