The 2021 US Open described in detail, in the form of day-by-day summaries.

Day 1 (August 30) Seeds out: Men's Singles: John Isner , Ugo Humbert , Cameron Norrie , Alejandro Davidovich Fokina , Marin Čilić , Filip Krajinović Women's Singles: Yulia Putintseva Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 1st Round Sloane Stephens Madison Keys 6–3, 1–6, 7–6(9–7) Men's Singles 1st Round Stefanos Tsitsipas Andy Murray 2–6, 7–6(9–7), 3–6, 6–3, 6–42021 US Open Opening Night Ceremony Women's Singles 1st Round Naomi Osaka Marie Bouzková 6–4, 6–1 Men's Singles 1st Round Daniil Medvedev Richard Gasquet 6–4, 6–3, 6–1Matches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 1st Round Garbiñe Muguruza Donna Vekić7–6(7–4), 7–6(7–5) Men's Singles 1st Round Brandon Nakashima [WC] John Isner 7–6(9–7), 7–6(8–6), 6–3 Women's Singles 1st Round Coco Gauff Magda Linette 5–7, 6–3, 6–4 Women's Singles 1st Round Aryna Sabalenka Nina Stojanović 6–4, 6–7(4–7), 6–0 Men's Singles 1st Round Roberto Bautista Agut Nick Kyrgios 6–3, 6–4, 6–0Matches on GrandstandEventWinnerLoserScore Women's Singles 1st Round Simona Halep Camila Giorgi 6–4, 7–6(7–3) Men's Singles 1st Round Andrey Rublev Ivo Karlović [Q]6–3, 7–6(7–3), 6–3 Men's Singles 1st Round Casper Ruud Yūichi Sugita [LL]6–3, 6–2, 6–2 Women's Singles 1st Round Victoria Azarenka Tereza Martincová6–4, 6–0 Women's Singles 1st Round Ons Jabeur Alizé Cornet 7–5, 7–5Matches start at 12 pm (Arthur Ashe Stadium) and 11am (other courts), night session starts at 7pm Eastern Daylight Time (EDT)

Day 2 (August 31) Seeds out: Men's Singles: Pablo Carreño Busta , Alex de Minaur , Lorenzo Sonego , Karen Khachanov , David Goffin , Fabio Fognini Women's Singles: Karolína Muchová , Veronika Kudermetova Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Men's Singles 1st Round Alexander Zverev Sam Querrey6–4, 7–5, 6–2 Women's Singles 1st Round Ashleigh Barty Vera Zvonareva6–1, 7–6(9–7) Men's Singles 1st Round Novak Djokovic Holger Rune [Q]6–1, 6–7(5–7), 6–2, 6–1 Women's Singles 1st Round Bianca Andreescu Viktorija Golubic 7–5, 4–6, 7–5Matches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 1st Round Karolína Plíšková Caty McNally [WC]6–3, 6–4 Women's Singles 1st Round Belinda Bencic Arantxa Rus6–4, 6–4 Men's Singles 1st Round Denis Shapovalov Federico Delbonis 6–2, 6–2, 6–3 Women's Singles 1st Round Anastasia Pavlyuchenkova Alison Riske 6–4, 6–2 Men's Singles 1st Round Taylor Fritz Alex de Minaur 7–6(7–4), 6–2, 1–6, 6–4Matches on GrandstandEventWinnerLoserScore Men's Singles 1st Round Kei Nishikori Salvatore Caruso 6–1, 6–1, 5–7, 6–3 Men's Singles 1st Round Matteo Berrettini Jérémy Chardy7–6(7–5), 7–6(9–7), 6–3 Women's Singles 1st Round Iga Świątek Jamie Loeb [Q]6–3, 6–4 Women's Singles 1st Round Petra Kvitová Polona Hercog6–1, 6–2Colored background indicates a night matchMatches start at 12 pm (Arthur Ashe Stadium) and 11am (other courts), night session starts at 7pm Eastern Daylight Time (EDT)

Day 3 (September 1) Half of the matches were played as scheduled, with the remaining matches on outer courts and Louis Armstrong Stadium postponed due to heavy rain caused by the remnants of Hurricane Ida.

Seeds out: Men's Singles: Casper Ruud , Grigor Dimitrov , Cristian Garín Women's Singles: Coco Gauff , Ekaterina Alexandrova Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 2nd Round Naomi Osaka Olga Danilović [Q]Walkover Women's Singles 2nd Round Simona Halep Kristína Kučová [LL]6–3, 6–1 Men's Singles 2nd Round Daniil Medvedev Dominik Koepfer 6–4, 6–1, 6–2 Women's Singles 2nd Round Sloane Stephens Coco Gauff 6–4, 6–2 Men's Singles 2nd Round Stefanos Tsitsipas Adrian Mannarino 6–3, 6–4, 6–7(4–7), 6–0 Men's Singles 2nd Round Diego Schwartzman Kevin Anderson 7–6(7–4), 6–3, 6–4Matches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 2nd Round Garbiñe Muguruza Andrea Petkovic6–4, 6–2 Women's Singles 2nd Round Victoria Azarenka Jasmine Paolini6–3, 7–6(7–1) Men's Singles 2nd Round Frances Tiafoe Guido Pella6–1, 6–2, 7–5 Women's Singles 2nd Round Barbora Krejčíková Christina McHale6–3, 6–1 Women's Singles 2nd Round Angelique Kerber vs. Anhelina Kalinina PostponedMatches on GrandstandEventWinnerLoserScore Men's Singles 2nd Round Andrey Rublev Pedro Martínez7–6(7–2), 6–7(5–7), 6–1, 6–1 Women's Singles 2nd Round Aryna Sabalenka Tamara Zidanšek 6–3, 6–1 Men's Doubles 1st Round Steve Johnson / Sam Querrey [WC]vs. Marcelo Arévalo / Matwé Middelkoop2–1, suspended Men's Doubles 1st Round Nikola Mektić / Mate Pavić vs. Nathaniel Lammons / Jackson Withrow [WC]PostponedColored background indicates a night matchMatches start at 12 pm (Arthur Ashe Stadium) and 11am (other courts), night session starts at 7pm Eastern Daylight Time (EDT)

Day 4 (September 2) Due to heavy rain associated with Hurricane Ida from the previous night, play was delayed one hour and began at 12:00 pm EDT. Seeds out: Men's Singles: Hubert Hurkacz , Alexander Bublik Women's Singles: Paula Badosa , Petra Martić Men's Doubles: Nikola Mektić / Mate Pavić , Juan Sebastián Cabal / Robert Farah , Łukasz Kubot / Marcelo Melo , Tim Pütz / Michael Venus Women's Doubles: Barbora Krejčíková / Kateřina Siniaková , Nicole Melichar-Martinez / Demi Schuurs , Asia Muhammad / Jessica Pegula Mixed Doubles: Luisa Stefani / Marcelo Melo Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 2nd Round Ashleigh Barty Clara Tauson 6–1, 7–5 Men's Singles 2nd Round Alexander Zverev Albert Ramos Viñolas 6–1, 6–0, 6–3 Women's Singles 2nd Round Angelique Kerber Anhelina Kalinina 6–3, 6–2 Men's Singles 2nd Round Novak Djokovic Tallon Griekspoor 6–2, 6–3, 6–2 Women's Singles 2nd Round Karolína Plíšková Amanda Anisimova 7–5, 6–7(5–7), 7–6(9–7)Matches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 2nd Round Belinda Bencic Martina Trevisan 6–3, 6–1 Women's Singles 2nd Round Petra Kvitová Kristýna Plíšková [Q] 7–6(7–4), 6–2 Men's Singles 2nd Round Gaël Monfils Steve Johnson 7–5, 4–6, 6–4, 6–4 Women's Singles 2nd Round Bianca Andreescu Lauren Davis 6–4, 6–4 Men's Singles 2nd Round Denis Shapovalov Roberto Carballés Baena 7–6(9–7), 6–3, 6–0Matches on GrandstandEventWinnerLoserScore Women's Singles 2nd Round Maria Sakkari Kateřina Siniaková 6–4, 6–2 Men's Singles 2nd Round Matteo Berrettini Corentin Moutet 7–6(7–2), 4–6, 6–4, 6–3 Men's Singles 2nd Round Jenson Brooksby [WC] Taylor Fritz 6–7(7–9), 7–6(12–10), 7–5, 6–2Colored background indicates a night matchMatches start at 12 pm, night session starts at 7pm Eastern Daylight Time (EDT)

Day 5 (September 3) Seeds out: Men's Singles: Stefanos Tsitsipas , Andrey Rublev , Roberto Bautista Agut Women's Singles: Naomi Osaka , Victoria Azarenka , Elena Rybakina , Ons Jabeur , Daria Kasatkina , Danielle Collins Women's Doubles: Ellen Perez / Květa Peschke , Aleksandra Krunić / Nina Stojanović Mixed Doubles: Bethanie Mattek-Sands / Jamie Murray , Chan Hao-ching / Michael Venus Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 3rd Round Garbiñe Muguruza Victoria Azarenka 6–4, 3–6, 6–2 Men's Singles 3rd Round Carlos Alcaraz Stefanos Tsitsipas 6–3, 4–6, 7–6(7–2), 0–6, 7–6(7–5) Women's Singles 3rd Round Leylah Fernandez Naomi Osaka 5–7, 7–6(7–2), 6–4 Men's Singles 3rd Round Frances Tiafoe Andrey Rublev 4–6, 6–3, 7–6(8–6), 4–6, 6–1Matches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 3rd Round Simona Halep Elena Rybakina 7–6(13–11), 4–6, 6–3 Men's Singles 3rd Round Daniil Medvedev Pablo Andújar 6–0, 6–4, 6–3 Women's Singles 3rd Round Angelique Kerber Sloane Stephens 5–7, 6–2, 6–3 Men's Singles 3rd Round Félix Auger-Aliassime Roberto Bautista Agut 6–3, 6–4, 4–6, 3–6, 6–3 Women's Singles 3rd Round Aryna Sabalenka Danielle Collins 6–3, 6–3Matches on GrandstandEventWinnerLoserScore Men's Singles 3rd Round Peter Gojowczyk [Q] Henri Laaksonen [Q]3–6, 6–3, 6–1, 6–4 Women's Singles 3rd Round Barbora Krejčíková Kamilla Rakhimova [LL]6–4, 6–2 Women's Singles 3rd Round Elina Svitolina Daria Kasatkina 6–4, 6–2 Men's Singles 3rd Round Diego Schwartzman Alex Molčan [Q]6–4, 6–3, 6–3 Women's Singles 3rd Round Elise Mertens Ons Jabeur 6–3, 7–5Colored background indicates a night matchMatches start at 12 pm at Arthur Ashe Stadium and 11 am in most courts, night session starts at 7pm Eastern Daylight Time (EDT)

Day 6 (September 4) Seeds out: Men's Singles: Denis Shapovalov , Gaël Monfils , Aslan Karatsev Women's Singles: Ashleigh Barty , Petra Kvitová , Jessica Pegula , Anett Kontaveit Men's Doubles: Raven Klaasen / Ben McLachlan , Simone Bolelli / Máximo González , Sander Gillé / Joran Vliegen Mixed Doubles: Nicole Melichar-Martinez / Ivan Dodig Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 3rd Round Maria Sakkari Petra Kvitová 6–4, 6–3 Men's Singles 3rd Round Novak Djokovic Kei Nishikori 6–7(4–7), 6–3, 6–3, 6–2 Women's Singles 3rd Round Shelby Rogers Ashleigh Barty 6–2, 1–6, 7–6(7–5) Men's Singles 3rd Round Alexander Zverev Jack Sock [WC] 3–6, 6–3, 6–2, 2–1, retiredMatches on Louis Armstrong StadiumEventWinnerLoserScore Women's Singles 3rd Round Bianca Andreescu Greet Minnen [LL] 6–1, 6–2 Women's Singles 3rd Round Belinda Bencic Jessica Pegula 6–2, 6–4 Men's Singles 3rd Round Jannik Sinner Gaël Monfils 7–6(7–1), 6–2, 4–6, 4–6, 6–4 Men's Singles 3rd Round Lloyd Harris Denis Shapovalov 6–4, 6–4, 6–4 Women's Singles 3rd Round Anastasia Pavlyuchenkova Varvara Gracheva 6–1, 6–4Matches on GrandstandEventWinnerLoserScore Men's Singles 3rd Round Matteo Berrettini Ilya Ivashka 6–7(5–7), 6–2, 6–4, 2–6, 6–3 Women's Singles 3rd Round Iga Świątek Anett Kontaveit 6–3, 4–6, 6–3 Women's Singles 3rd Round Karolína Plíšková Ajla Tomljanović 6–3, 6–2 Men's Singles 3rd Round Reilly Opelka Nikoloz Basilashvili 7–6(7–5), 6–3, 6–4Colored background indicates a night matchMatches start at 12 pm at Arthur Ashe Stadium and 11 am in most courts, night session starts at 7pm Eastern Daylight Time (EDT)

Day 7 (September 5) Seeds out: Men's Singles: Diego Schwartzman , Dan Evans Women's Singles: Garbiñe Muguruza , Simona Halep , Elise Mertens , Angelique Kerber Women's Doubles: Veronika Kudermetova / Bethanie Mattek-Sands Mixed Doubles: Ena Shibahara / Ben McLachlan Schedule of Play

Matches on main courtsMatches on Arthur Ashe StadiumEventWinnerLoserScore Women's Singles 4th Round Elina Svitolina Simona Halep 6–3, 6–3 Men's Singles 4th Round Daniil Medvedev Dan Evans 6–3, 6–4, 6–3 Women's Doubles 2nd Round Gabriela Dabrowski Luisa Stefani Petra Martić Shelby Rogers6–4, 6–7(5–7), 7–6(7–3) Men's Singles 4th Round Félix Auger-Aliassime Frances Tiafoe 4–6, 6–2, 7–6(8–6), 6–4 Women's Singles 4th Round Barbora Krejčíková Garbiñe Muguruza 6–3, 7–6(7–4)Matches on Louis Armstrong StadiumEventWinnerLoserScore Men's Singles 4th Round Botic van de Zandschulp [Q] Diego Schwartzman 6–3, 6–4, 5–7, 5–7, 6–1 Women's Singles 4th Round Leylah Fernandez Angelique Kerber 4–6, 7–6(7–5), 6–2 Women's Singles 4th Round Aryna Sabalenka Elise Mertens 6–4, 6–1Matches on GrandstandEventWinnerLoserScore Women's Doubles 3rd Round Caroline Dolehide Storm Sanders Veronika Kudermetova Bethanie Mattek-Sands 4–6, 6–3, 6–2 Men's Doubles 3rd Round Steve Johnson [WC] Sam Querrey [WC] Ričardas Berankis Benoît Paire 6–3, 6–4 Men's Singles 4th Round Carlos Alcaraz Peter Gojowczyk [Q] 5–7, 6–1, 5–7, 6–2, 6–0Colored background indicates a night matchMatches start at 12 pm at Arthur Ashe Stadium and 11 am in most courts, night session starts at 7pm Eastern Daylight Time (EDT)

Day 8 (September 6) Seeds out: Men's Singles: Jannik Sinner , Reilly Opelka