![Jack Sock returns a shot to Yoshihito Nishioka during a Men's Singles match at the 2021 US Open, Tuesday, Aug. 31, 2021 in Flushing, NY. (Brad Penner/USTA via AP Stock Photo - Alamy Jack Sock returns a shot to Yoshihito Nishioka during a Men's Singles match at the 2021 US Open, Tuesday, Aug. 31, 2021 in Flushing, NY. (Brad Penner/USTA via AP Stock Photo - Alamy](https://c8.alamy.com/comp/2NMR3KP/jack-sock-returns-a-shot-to-yoshihito-nishioka-during-a-mens-singles-match-at-the-2021-us-open-tuesday-aug-31-2021-in-flushing-ny-brad-pennerusta-via-ap-2NMR3KP.jpg)
Jack Sock returns a shot to Yoshihito Nishioka during a Men's Singles match at the 2021 US Open, Tuesday, Aug. 31, 2021 in Flushing, NY. (Brad Penner/USTA via AP Stock Photo - Alamy
![ATP Washington 2021 | Jack Sock-Yoshihito Nishioka: Nadal se medirá a Sock tras la retirada del japonés (6-7(3) y 4-0) - Eurosport ATP Washington 2021 | Jack Sock-Yoshihito Nishioka: Nadal se medirá a Sock tras la retirada del japonés (6-7(3) y 4-0) - Eurosport](https://i.eurosport.com/2021/08/03/3191973-65394728-2560-1440.jpg)
ATP Washington 2021 | Jack Sock-Yoshihito Nishioka: Nadal se medirá a Sock tras la retirada del japonés (6-7(3) y 4-0) - Eurosport
![New York, United States. 31st Aug, 2021. Jack Sock of the USA hits a forehand to Yoshihito Nishioka of Japan in the second set of their first round match held on Court New York, United States. 31st Aug, 2021. Jack Sock of the USA hits a forehand to Yoshihito Nishioka of Japan in the second set of their first round match held on Court](https://c8.alamy.com/comp/2GGG7F3/new-york-united-states-31st-aug-2021-jack-sock-of-the-usa-hits-a-forehand-to-yoshihito-nishioka-of-japan-in-the-second-set-of-their-first-round-match-held-on-court-13-at-the-2021-us-open-tennis-championships-at-the-usta-billie-jean-king-national-tennis-center-in-new-york-city-on-tuesday-august-31-2021-photo-by-monika-graffupi-credit-upialamy-live-news-2GGG7F3.jpg)
New York, United States. 31st Aug, 2021. Jack Sock of the USA hits a forehand to Yoshihito Nishioka of Japan in the second set of their first round match held on Court
![US Open 2021 - 'I would have been planning my holiday' - Alexander Zverev relieved by Jack Sock retirement - Eurosport US Open 2021 - 'I would have been planning my holiday' - Alexander Zverev relieved by Jack Sock retirement - Eurosport](https://imgresizer.eurosport.com/unsafe/1200x0/filters:format(jpeg)/origin-imgresizer.eurosport.com/2021/09/05/3213519-65825648-2560-1440.jpg)
US Open 2021 - 'I would have been planning my holiday' - Alexander Zverev relieved by Jack Sock retirement - Eurosport
![Sock stumbles at Newport as he tries to climb back up the ladder | Local Sports | thesunchronicle.com Sock stumbles at Newport as he tries to climb back up the ladder | Local Sports | thesunchronicle.com](https://bloximages.chicago2.vip.townnews.com/thesunchronicle.com/content/tncms/assets/v3/editorial/f/48/f483436d-dd49-573a-8698-aab63dd3837a/60f0ae4c51341.image.jpg?resize=400%2C267)
Sock stumbles at Newport as he tries to climb back up the ladder | Local Sports | thesunchronicle.com
![WATCH: Jack Sock Receives Standing Ovation From Jam-Packed US Open 2021 Crowd After Stunning Display - EssentiallySports WATCH: Jack Sock Receives Standing Ovation From Jam-Packed US Open 2021 Crowd After Stunning Display - EssentiallySports](https://image-cdn.essentiallysports.com/wp-content/uploads/2021-09-05T021742Z_1326247194_MT1USATODAY16690778_RTRMADP_3_TENNIS-US-OPEN.jpg)
WATCH: Jack Sock Receives Standing Ovation From Jam-Packed US Open 2021 Crowd After Stunning Display - EssentiallySports
![US Open Tennis on X: "Alexander Zverev advances to Round 4 after Jack Sock is forced to retire with injury. https://t.co/qpJWeVXhw1" / X US Open Tennis on X: "Alexander Zverev advances to Round 4 after Jack Sock is forced to retire with injury. https://t.co/qpJWeVXhw1" / X](https://pbs.twimg.com/media/E-fiQTnXEAI-LgC.jpg:large)