In tennis, the 2018 US Open Series was the fifteenth edition of the US Open Series, which comprises]d a group of hard court tournaments that started on July 23, 2018 in Atlanta and concluded in Connecticut for the women and in Winston-Salem for the men on August 26, 2018. This edition consisted of three separate men's tournaments and three women's tournaments, with the Western & Southern Open hosting both a men's and women's event.^[1][2] The series was headlined by two ATP World Tour Masters 1000 and two WTA Premier 5 events.

Legend
Grand Slam Event
ATP Masters 1000 and WTA Premier 5
ATP World Tour 500 and WTA Premier
ATP World Tour 250 and WTA International

Week	Date[2]	Men's Events	Women's Events
1	July 23 – July 29	Atlanta BB&T Atlanta Open 2018 Champion: John Isner	No Series Event Held This Week
2	July 30 – August 5	No Series Event Held This Week	San Jose Silicon Valley Classic 2018 Champion: Mihaela Buzărnescu
3	August 6 – August 12	Toronto Rogers Cup presented by National Bank 2018 Champion: Rafael Nadal	Montreal Rogers Cup presented by National Bank 2018 Champion: Simona Halep
4	August 13 – August 19	Cincinnati Western & Southern Open 2018 Champion: Novak Djokovic	Cincinnati Western & Southern Open 2018 Champion: Kiki Bertens
5	August 20 – August 26	Winston-Salem Winston-Salem Open 2018 Champion: Daniil Medvedev	New Haven Connecticut Open 2018 Champion: Aryna Sabalenka
6–7	August 27 – September 9	New York US Open 2018 Champion: Novak Djokovic	New York US Open 2018 Champion: Naomi Osaka

John Isner was the defending champion and successfully defended his title, defeating Ryan Harrison in a rematch of the 2017 final, 5–7, 6–3, 6–4.

	Quarterfinals							Semifinals							Finals
	1	John Isner	7	4	6
	7	Mischa Zverev	5	6	1
								1	John Isner	6	66	6
								4	Matthew Ebden	4	78	1
	4	Matthew Ebden	6	6
		Marcos Baghdatis	3	2
															1	John Isner	5	6	6
															8	Ryan Harrison	7	3	4
	8	Ryan Harrison	63	6	77
	3/WC	Chung Hyeon	77	2	65
								8	Ryan Harrison	2	6	6
									Cameron Norrie	6	3	2
		Cameron Norrie	7	3
	2	Nick Kyrgios	5	0r

Madison Keys was the defending champion, but withdrew due to a wrist injury.

Mihaela Buzărnescu won her first WTA Tour singles title, defeating Maria Sakkari in the final, 6–1, 6–0.

	Quarterfinals							Semifinals							Final
		Victoria Azarenka	77	0r
		Danielle Collins	64	3
									Danielle Collins	6	5	2
									Maria Sakkari	3	7	6
	3/WC	Venus Williams	4	62
		Maria Sakkari	6	77
																Maria Sakkari	1	0
															5	Mihaela Buzărnescu	6	6
		Johanna Konta	64	3
	4	Elise Mertens	77	6
								4	Elise Mertens	6	3	1
								5	Mihaela Buzărnescu	4	6	6
	5	Mihaela Buzărnescu	6	7
		Ajla Tomljanović	1	5

Alexander Zverev was the defending champion,^[3] but lost in the quarterfinals to Stefanos Tsitsipas.

Rafael Nadal won his fourth Rogers Cup title, defeating Tsitsipas in the final, 6–2, 7–6^(7–4).

	Quarterfinals							Semifinals							Final
	1	Rafael Nadal	2	6	6
	6	Marin Čilić	6	4	4
								1	Rafael Nadal	77	6
									Karen Khachanov	63	4
		Robin Haase	3	1
		Karen Khachanov	6	6
															1	Rafael Nadal	6	77
																Stefanos Tsitsipas	2	64
	5	Grigor Dimitrov	2	2
	4	Kevin Anderson	6	6
								4	Kevin Anderson	77	4	67
									Stefanos Tsitsipas	64	6	79
		Stefanos Tsitsipas	3	713	6
	2	Alexander Zverev	6	611	4

Elina Svitolina was the defending champion,^[4] but she lost to Sloane Stephens in the semifinals.

World No. 1 Simona Halep won the title, defeating Stephens in the final, 7–6^(8–6), 3–6, 6–4.

	Quarterfinals							Semifinals							Final
	1	Simona Halep	7	6
	6	Caroline Garcia	5	1
								1	Simona Halep	6	6
								15	Ashleigh Barty	4	1
	15	Ashleigh Barty	6	6
		Kiki Bertens	3	1
															1	Simona Halep	78	3	6
															3	Sloane Stephens	66	6	4
		Anastasija Sevastova	2	2
	3	Sloane Stephens	6	6
								3	Sloane Stephens	6	6
								5	Elina Svitolina	3	3
	5	Elina Svitolina	7	6
	14	Elise Mertens	5	3

Grigor Dimitrov was the defending champion, but lost to Novak Djokovic in the third round.

Djokovic won the title, defeating Roger Federer in the final, 6–4, 6–4, becoming the first player to win all nine ATP Masters 1000 events since its inception in 1990.

	Quarterfinals							Semifinals							Final
		Milos Raonic	5	6	3
	10	Novak Djokovic	7	4	6
								10	Novak Djokovic	6	3	6
								7	Marin Čilić	4	6	3
	13	Pablo Carreño Busta	67	4
	7	Marin Čilić	79	6
															10	Novak Djokovic	6	6
															2	Roger Federer	4	4
	11	David Goffin	77	77
	4	Juan Martín del Potro	65	64
								11	David Goffin	63	1r
								2	Roger Federer	77	1
	WC	Stan Wawrinka	77	66	2
	2	Roger Federer	62	78	6

Garbiñe Muguruza was the defending champion, but lost in the second round to Lesia Tsurenko.

Kiki Bertens won her first hard court & Premier 5 level title by beating Simona Halep in the final, 2–6, 7–6^(8–6), 6–2.

	Quarterfinals							Semifinals							Final
	1	Simona Halep	6	6
		Lesia Tsurenko	4	1
								1	Simona Halep	6	6
									Aryna Sabalenka	3	4
	13	Madison Keys	3	4
		Aryna Sabalenka	6	6
															1	Simona Halep	6	66	2
																Kiki Bertens	2	78	6
	8	Petra Kvitová	7	5	6
	15	Elise Mertens	5	7	3
								8	Petra Kvitová	6	4	2
									Kiki Bertens	3	6	6
	5	Elina Svitolina	4	3
		Kiki Bertens	6	6

Roberto Bautista Agut was the defending champion but chose not to participate this year.

Daniil Medvedev won the title, defeating Steve Johnson in the final, 6–4, 6–4.

	Quarterfinals							Semifinals							Final
		Daniil Medvedev	77	6
		Ryan Harrison	64	4
									Daniil Medvedev	6	6
									Taro Daniel	1	1
	14	Nicolás Jarry	6	2	1
		Taro Daniel	4	6	6
																Daniil Medvedev	6	6
															8	Steve Johnson	4	4
	8	Steve Johnson	6	6
	3/WC	Kyle Edmund	1	2
								8	Steve Johnson	6	6
								2	Pablo Carreño Busta	3	4
	6	Chung Hyeon	3	4
	2	Pablo Carreño Busta	6	6

Daria Gavrilova was the defending champion, but lost to Aryna Sabalenka in the second round.

Sabalenka went on to win her first WTA Tour title, defeating Carla Suárez Navarro in the final, 6–1, 6–4.

	Quarterfinals							Semifinals							Final
	LL	Belinda Bencic	3	2
		Aryna Sabalenka	6	6
									Aryna Sabalenka	6	77
								5	Julia Görges	4	63
		Ekaterina Makarova	4	2
	5	Julia Görges	6	6
																Aryna Sabalenka	6	6
																Carla Suárez Navarro	1	4
		Carla Suárez Navarro	6	0
	3	Petra Kvitová	3	0r
									Carla Suárez Navarro	4
								Q	Monica Puig	4r
	Q	Monica Puig	7	1	6
	2	Caroline Garcia	5	6	2

Rafael Nadal was the defending champion, but retired in his semifinal match against Juan Martín del Potro.

Novak Djokovic won the title, his third at the US Open and 14th Grand Slam title overall, tying Pete Sampras, defeating del Potro in the final, 6–3, 7–6^(7–4), 6–3.

	Quarterfinals									Semifinals									Final
	1	Rafael Nadal	0	6	7	64	77
	9	Dominic Thiem	6	4	5	77	65
										1	Rafael Nadal	63	2	0r
										3	Juan Martín del Potro	77	6	0
	3	Juan Martín del Potro	65	6	77	6
	11	John Isner	77	3	64	2
																			3	Juan Martín del Potro	3	64	3
																			6	Novak Djokovic	6	77	6
	7	Marin Čilić	6	4	65	6	4
	21	Kei Nishikori	2	6	77	4	6
										21	Kei Nishikori	3	4	2
										6	Novak Djokovic	6	6	6
	6	Novak Djokovic	6	6	6
		John Millman	3	4	4

Sloane Stephens was the defending champion, but lost to Anastasija Sevastova in the quarterfinals.

Naomi Osaka won the title by defeating Serena Williams in the final, 6–2, 6–4.

	Quarterfinals							Semifinals							Final
	17	Serena Williams	6	6
	8	Karolína Plíšková	4	3
								17	Serena Williams	6	6
								19	Anastasija Sevastova	3	0
	3	Sloane Stephens	2	3
	19	Anastasija Sevastova	6	6
															17	Serena Williams	2	4
															20	Naomi Osaka	6	6
	30	Carla Suárez Navarro	4	3
	14	Madison Keys	6	6
								14	Madison Keys	2	4
								20	Naomi Osaka	6	6
	20	Naomi Osaka	6	6
		Lesia Tsurenko	1	1

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