Jonas Björkman and Todd Woodbridge were the defending champions, but lost in the third round to Leander Paes and David Rikl.
In the 1990 Monte Carlo Open doubles, Tomáš Šmíd and Mark Woodforde were the defending champions, but Woodforde did not participate this year. Šmíd partnered Petr Korda.
Mark Knowles and Daniel Nestor were the defending champions, but lost in the first round to Paul Goldstein and Jim Thomas.
Wu Yibing was the defending champion, but was no longer eligible to participate in junior tournaments.
Lorenzo Musetti won the boys' singles tennis title at the 2019 Australian Open, defeating Emilio Nava in the final, 4–6, 6–2, 7–6(14–12). He saved a championship point in the third-set tiebreak.
Eliot Spizzirri and Tyler Zink won the boys' doubles tennis title at the 2019 US Open, defeating Andrew Paulson and Alexander Zgirovsky in the final, 7–6(7–4), 6–4.
Eliot Spizzirri is an American tennis player. Spizzirri has a career-high ATP singles ranking of No. 244 achieved on 4 November 2024 and a doubles ranking of No. 393 achieved on that same date.
Tom Kempers and Daniel Orsanic were the defending champions, but Kempers did not compete this year. Orsanic teamed up with Tomás Carbonell and lost in the second round to Jürgen Melzer and Alexander Peya.
Luca Van Assche won the title, defeating Arthur Fils in an all-French final, 6–4, 6–2. This was the first Grand Slam junior tournament with all-French semifinalists.
Shintaro Mochizuki was the defending champion having won the previous edition in 2019. He participated in the men's singles qualifying, but lost to Tallon Griekspoor in the second round.
Jonáš Forejtek and Jiří Lehečka were the defending champions, but were no longer eligible to participate in junior tournaments.
Rajeev Ram and Joe Salisbury defeated the defending champion Bruno Soares and his partner Jamie Murray in the final, 3–6, 6–2, 6–2 to win the men's doubles tennis title at the 2021 US Open. It was the second major title for Ram and Salisbury as a team, following the 2020 Australian Open. Ram and Salisbury saved four match points en route to the title, in the quarterfinals against Matthew Ebden and Max Purcell.
Jonáš Forejtek was the defending champion, having won the previous edition in 2019, but was no longer eligible to participate in junior events.
Camila Osorio was the defending champion, having won the previous edition in 2019, but was no longer eligible to participate in junior events. She participated in the women's singles event, but lost to Ons Jabeur in the second round.
Kamilla Bartone and Oksana Selekhmeteva were the defending champions, having won the previous edition in 2019, however Bartone was no longer eligible to participate in junior events, whilst Selekhmeteva chose not to participate.
Bruno Kuzuhara and Coleman Wong defeated Alex Michelsen and Adolfo Daniel Vallejo in the final, 6–3, 7–6(7–3) to win the boys' doubles title at the 2022 Australian Open. Wong became the first Hongkonger win an Australian Open title, and the first Hongkonger to win two titles at majors, having previously won the junior doubles at the 2021 US Open.
Petr Nesterov is a Bulgarian tennis player. He has a career-high ATP singles ranking of world No. 384 and a doubles ranking of No. 267 achieved on 28 October 2024. Nesterov reached the final of the 2021 US Open Junior doubles with Ukrainian Viacheslav Bielinskyi.
Daniel Rincón was the reigning champion, but is no longer eligible to participate in junior events.
Yuki Bhambri and Saketh Myneni were the defending champions but chose not to defend their title.
Rafael Jódar defeated Nicolai Budkov Kjær in the final, 2–6, 6–2, 7–6(10–1), to win the boys' singles title at the 2024 US Open. Jódar was the third Spanish player in four years to win the boys' singles, after Daniel Rincón in 2021 and Martín Landaluce in 2022.
Max Westphal 
Coleman Wong 
Viacheslav Bielinskyi 
Petr Nesterov 
