Benjamin Bonzi and Quentin Halys were the defending champions, but were not eligible to compete this year.
Andrey Rublev was the defending champion, but he chose not to participate this year.
Orlando Luz and Marcelo Zormann were the defending champions, but they chose to participate at the Pan American Games instead.
Noah Rubin was the defending champion, but chose not to participate this year.
Omar Jasika and Naoki Nakagawa are the defending champions, but they chose not to participate.
Félix Auger-Aliassime and Denis Shapovalov won the title, defeating Brandon Holt and Riley Smith in the final, 7–5, 7–6(7–3).
Omar Jasika was the defending champion, but he chose not to participate. Taylor Harry Fritz won the title, defeating Tommy Paul in the final, 6–2, 6–7(4–7), 6–2.
Roman Safiullin defeated Hong Seong-chan in the final, 7–5, 7–6(7–2) to win the boys' singles tennis title at the 2015 Australian Open.
Lucas Miedler and Bradley Mousley were the defending champions but were no longer eligible to compete in juniors in 2015.
Jake Delaney and Marc Polmans were the defending champions, however both players were no longer eligible to play juniors.
Álvaro López San Martín and Jaume Munar were the defending champions, but were no longer eligible to participate.
Lý Hoàng Nam and Sumit Nagal were the defending champions, but were both ineligible to compete this year.
Mikhail Elgin and Yaraslav Shyla were the defending champions but chose not to defend their title.
Christian Harrison and Peter Polansky were the defending champions but only Harrison chose to defend his title, partnering Andrew Harris. Harrison lost in the semifinals to Chung Yun-seong and Michail Pervolarakis.
Max Purcell and Luke Saville were the defending champions but only Purcell chose to defend his title, partnering Marc Polmans. Purcell withdrew before his semifinal match against Chung Yun-seong and Aleksandar Kovacevic due to injury.
Chung Yun-seong and Ajeet Rai were the defending champions but chose not to defend their title.
Guido Andreozzi and Ignacio Carou were the defending champions but lost in the semifinals to Chung Yun-seong and Christian Langmo.
André Göransson and Ben McLachlan were the defending champions but chose not to defend their title.
Adrian Mannarino defeated Alex Michelsen in the final, 6–2, 6–4 to win the singles tennis title at the 2023 Hall of Fame Open. It was his third ATP Tour singles title.
Anirudh Chandrasekar and Vijay Sundar Prashanth were the defending champions but chose not to defend their title.
Evan King and Reese Stalder were the defending champions but chose not to defend their title.
Saketh Myneni 
Constantin Bittoun Kouzmine
