| Men's singles | |
|---|---|
| 2023 NSW Open | |
| 2022 Champion |  Hsu Yu-hsiou |
Hsu Yu-hsiou was the defending champion [1] but chose not to defend his title.
| Men's singles | |
|---|---|
| 2023 NSW Open | |
| 2022 Champion | Hsu Yu-hsiou |
Hsu Yu-hsiou was the defending champion [1] but chose not to defend his title.
Thanasi Kokkinakis Rinky Hijikata 
Taro Daniel James Duckworth (withdrew) Shintaro Mochizuki Marc Polmans 
Hong Seong-chan (first round) Tristan Schoolkate (first round)| Semifinals | Final | ||||||||||||
| | |||||||||||||
| | |||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | T Kokkinakis | 6 | 6 | ||||||||||||||||||||||||
 F Peliwo | 3 | 1 | 1 | T Kokkinakis | 7 | 7 | |||||||||||||||||||||
| Q |  A Rai | 2 | 62 | P Sekulic | 5 | 5 | |||||||||||||||||||||
| P Sekulic | 6 | 77 | 1 | T Kokkinakis | |||||||||||||||||||||||
| Q | H Moriya | 6 | 710 | R Noguchi | |||||||||||||||||||||||
| N Nakagawa | 3 | 68 | Q | H Moriya | 1 | 2 | |||||||||||||||||||||
| R Noguchi | 6 | 6 | R Noguchi | 6 | 6 | ||||||||||||||||||||||
| 7 | S-c Hong | 2 | 2 | ||||||||||||||||||||||||
| LL | B Mott | 6 | 6 | | |||||||||||||||||||||||
| Q | R Statham | 3 | 4 | LL | B Mott | 6 | 6 | ||||||||||||||||||||
| Q |  R Seggerman | 6 | 4 | 6 | Q | R Seggerman | 2 | 3 | |||||||||||||||||||
 B Lock | 3 | 6 | 4 | LL | B Mott | ||||||||||||||||||||||
| WC | Jacob Bradshaw | 5 | 2 | 6 | M Polmans | ||||||||||||||||||||||
 A Weber | 7 | 6 | A Weber | 4 | 4 | ||||||||||||||||||||||
 C Sinclair | 4 | 2 | 6 | M Polmans | 6 | 6 | |||||||||||||||||||||
| 6 | M Polmans | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | S Mochizuki | 6 | 6 | ||||||||||||||||||||||||
| O Jasika | 4 | 4 | 5 | S Mochizuki | 712 | 7 | |||||||||||||||||||||
| Y Shimizu | 3 | 2 | K Uchida | 610 | 5 | ||||||||||||||||||||||
| K Uchida | 6 | 6 | 5 | S Mochizuki | |||||||||||||||||||||||
| L Saville | 7 | 6 | 3 | T Daniel | |||||||||||||||||||||||
| WC | B Ellis | 5 | 2 | L Saville | 4 | 2 | |||||||||||||||||||||
| Y Uchiyama | 2 | 1r | 3 | T Daniel | 6 | 6 | |||||||||||||||||||||
| 3 | T Daniel | 6 | 2 | | |||||||||||||||||||||||
| 8 | T Schoolkate | 69 | 4 | ||||||||||||||||||||||||
| Q | J-s Nam | 711 | 6 | Q | J-s Nam | 6 | 6 | ||||||||||||||||||||
| D Sweeny | 4 | 6 | 79 | D Sweeny | 4 | 2 | |||||||||||||||||||||
| LL | Y Takahashi | 6 | 3 | 67 | Q | J-s Nam | |||||||||||||||||||||
| WC | Pavle Marinkov | 65 | 2 | 2 | R Hijikata | ||||||||||||||||||||||
| SE |  C Wong | 77 | 6 | SE | C Wong | 6 | 3 | 2 | |||||||||||||||||||
| Q | Matthew Dellavedova | 3 | 4 | 2 | R Hijikata | 4 | 6 | 6 | |||||||||||||||||||
| 2 | R Hijikata | 6 | 6 | ||||||||||||||||||||||||
Seiko Okamoto and Maki Arai were the defending champions, but both players chose not to participate.
Chan Chin-wei and Hsu Wen-hsin won the title, defeating Remi Tezuka and Akiko Yonemura 6–3, 6–4 in the final.
Annika Beck was the 2012 champion, but was no longer eligible to compete in junior tennis, and thus couldn't defend her title.
Eugenie Bouchard was the defending champion, but was chosen to compete in ladies' singles instead where she lost to Carla Suárez Navarro in the third round.
Samantha Crawford was the defending champion having won the 2012 event, but chose not to compete in 2013.
Chan Chin-wei and Xu Yifan were the defending champions but Xu chose to participate at Guangzhou instead. Chan partnered Hsu Chieh-yu, but lost in the semifinals to Mona Barthel and Mandy Minella.
Kristie Ahn was the defending champion, but decided not to participate this year.
Jelena Janković was the defending champion, but lost in the final to Lesia Tsurenko 4–6, 6–3, 4–6.
Alex de Minaur and Blake Ellis were the defending champions, but both players chose not to participate.
Nicola Kuhn and Zsombor Piros won the boys' doubles tennis title at the 2017 French Open, defeating Vasil Kirkov and Danny Thomas in the final, 6–4, 6–4.
Denis Shapovalov was the defending champion but chose to compete in the gentlemen's singles instead. He lost to Jerzy Janowicz in the first round.
Kenneth Raisma and Stefanos Tsitsipas were the defending champions but both players were no longer eligible to participate in junior events.
Juan Carlos Aguilar and Felipe Meligeni Alves were the defending champions, but both players were ineligible to participate.
Hugo Gaston and Clément Tabur won the boys' doubles tennis title at the 2018 Australian Open, defeating Rudolf Molleker and Henri Squire in the final, 6–2, 6–2.
Shahar Pe'er was the defending champion, but did not compete in the Juniors in this year.
Marina Erakovic and Michaëlla Krajicek were the defending champions, but Michaëlla Krajicek did not compete in the juniors that year.
Axel Geller and Hsu Yu-hsiou were the defending champions, but both players were ineligible to participate in junior events.
Hsu Yu-hsiou and Wu Yibing were the defending champions, but both players were no longer eligible to participate in junior tournaments.
Jessica Moore and Ellen Perez were the defending champions, but Moore chose to participate at the 2019 St. Petersburg Ladies' Trophy instead. Perez partnered alongside compatriot Arina Rodionova, but lost in the semifinals to Chang Kai-chen and Hsu Ching-wen.
Andrey Golubev and Aleksandr Nedovyesov were the defending champions but chose not to defend their title.
Hsu Yu-hsiou and Benjamin Lock were the defending champions and successfully defended their title, defeating Oleksii Krutykh and Grigoriy Lomakin 6–3, 6–4 in the final.