![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
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US Open 2021 - 'I would have been planning my holiday' - Alexander Zverev relieved by Jack Sock retirement - Eurosport
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WATCH: Jack Sock Receives Standing Ovation From Jam-Packed US Open 2021 Crowd After Stunning Display - EssentiallySports
![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
![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)
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
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