| Singles | |
|---|---|
| 2016 Kobe Challenger | |
| Champion |  Chung Hyeon |
| Runner-up |  James Duckworth |
| Final score | 6–4, 7–6(7–2) |
John Millman was the defending champion but chose not to defend his title.
Chung Hyeon won the title after defeating James Duckworth 6–4, 7–6(7–2) in the final.
Yūichi Sugita (first round) Yoshihito Nishioka (quarterfinals) Taro Daniel (first round) Go Soeda (semifinals) Chung Hyeon (champion) Lee Duck-hee (semifinals) James Duckworth (final) Tatsuma Ito (first round)| Semifinals | Final | ||||||||||||
| 6 | Lee Duck-hee | 62 | 4 | ||||||||||
| 7 | James Duckworth | 77 | 6 | ||||||||||
| 7 | James Duckworth | 4 | 62 | ||||||||||
| 5 | Chung Hyeon | 6 | 77 | ||||||||||
| 4 | Go Soeda | 3 | 77 | 3 | |||||||||
| 5 | Chung Hyeon | 6 | 64 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Y Sugita | 3 | 2 | ||||||||||||||||||||||||
| Y Uchiyama | 6 | 6 | Y Uchiyama | 6 | 6 | ||||||||||||||||||||||
 A Michon | 6 | 6 | A Michon | 2 | 3 | ||||||||||||||||||||||
| Q |  K-y Lee | 4 | 0 | Y Uchiyama | 1 | 0r | |||||||||||||||||||||
| T Chen | 4 | 4 | 6 | D-h Lee | 6 | 2 | |||||||||||||||||||||
| WC | Y Watanuki | 6 | 6 | WC | Y Watanuki | 1 | 2 | ||||||||||||||||||||
| Q | Kim Cheong-eui | 1 | 6 | 3 | 6 | D-h Lee | 6 | 6 | |||||||||||||||||||
| 6 | D-h Lee | 6 | 3 | 6 | 6 | D-h Lee | 62 | 4 | |||||||||||||||||||
| 3 | T Daniel | 1 | 1 | 7 | J Duckworth | 77 | 6 | ||||||||||||||||||||
| H Moriya | 6 | 6 | H Moriya | 3 | 3 | ||||||||||||||||||||||
 P Gunneswaran | 3 | 60 | L Lokoli | 6 | 6 | ||||||||||||||||||||||
| L Lokoli | 6 | 77 | L Lokoli | 5 | 62 | ||||||||||||||||||||||
 A Pavić | 5 | 4 | 7 | J Duckworth | 7 | 77 | |||||||||||||||||||||
| J-P Smith | 7 | 6 | J-P Smith | 3 | 2 | ||||||||||||||||||||||
| Q | Shintaro Imai | 0 | 77 | 4 | 7 | J Duckworth | 6 | 6 | |||||||||||||||||||
| 7 | J Duckworth | 6 | 64 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | T Ito | 63 | 6 | 4 | |||||||||||||||||||||||
| L Saville | 77 | 4 | 6 | L Saville | 4 | 66 | |||||||||||||||||||||
 A Weintraub | 7 | 6 | A Weintraub | 6 | 78 | ||||||||||||||||||||||
| Q | K Uesugi | 5 | 4 | A Weintraub | 2 | 6 | 1 | ||||||||||||||||||||
| WC | Makoto Ochi | 3 | 1 | 4 | G Soeda | 6 | 1 | 6 | |||||||||||||||||||
| WC | Ken Onishi | 6 | 6 | WC | K Onishi | 0 | 67 | ||||||||||||||||||||
| Shuichi Sekiguchi | 1 | 0 | 4 | G Soeda | 6 | 79 | |||||||||||||||||||||
| 4 | G Soeda | 6 | 6 | 4 | G Soeda | 3 | 77 | 3 | |||||||||||||||||||
| 5 | H Chung | 6 | 6 | 5 | H Chung | 6 | 64 | 6 | |||||||||||||||||||
| S-c Hong | 1 | 3 | 5 | H Chung | 1 | 7 | 6 | ||||||||||||||||||||
| E Leshem | 2 | 4 |  D Masur | 6 | 5 | 3 | |||||||||||||||||||||
| D Masur | 6 | 6 | 5 | H Chung | 7 | 6 | |||||||||||||||||||||
| Yuya Kibi | 6 | 64 | 6 | 2 | Y Nishioka | 5 | 4 | ||||||||||||||||||||
| WC | Y Takahashi | 2 | 77 | 3 | Y Kibi | 1 | 4 | ||||||||||||||||||||
| S-w Kwon | 4 | 2 | 2 | Y Nishioka | 6 | 6 | |||||||||||||||||||||
| 2 | Y Nishioka | 6 | 6 | ||||||||||||||||||||||||
Luke Saville was last year's champion; however, being no longer a junior player, he did not defend his title.
Compatriots to Saville and home players, Nick Kyrgios and wildcard Thanasi Kokkinakis played off in the final. Kyrgios, who was also a winner of Roland Garros and Wimbledon in junior doubles, defeated Hopman Cup player Kokkinakis, 7–6(7–4), 6–3.
Nick Kyrgios was the defending champion. However, he did not defend the title after turning 18 and joining the ATP.
Alexander Zverev won the title, defeating Stefan Kozlov in the final, 6–3, 6–0.
Blaž Kavčič was the defending champion, but elected not to defend his title.
Hyeon Chung clinched his maiden ATP Challenger Tour title, beating Jordan Thompson 7–6(7–0), 6–4 in the final.
Matt Reid was the defending champion, but lost in the first round to Radu Albot.
Chung Hyeon won the title, defeating Alex Bolt in final, 6–2, 7–5.
Fernando Verdasco was the defending champion, but lost to Sam Querrey in the semifinals.
Jack Sock won his first ATP singles title, defeating Querrey in the final, 7–6(11–9), 7–6(7–2).
Andy Murray defeated Novak Djokovic in the final, 6–4, 4–6, 6–3, to win the men's singles title at the 2015 Canadian Open. It was Murray's first win against his rival Djokovic since the 2013 Wimbledon final, having lost eight consecutive matches to him in that span.
Chung Hyeon was the defending champion, but lost in the first round to Konstantin Kravchuk.
Peter Gojowczyk was the defending champion but chose not to defend his title.
Benjamin Mitchell was the defending champion but chose not to defend his title.
Yoshihito Nishioka was the defending champion but lost in the quarterfinals to James Duckworth.
Wu Di was the defending champion but lost in the first round to Tommy Paul.
Dominic Thiem was the defending champion, but lost in the quarterfinals to Sam Querrey.
Defending champion Rafael Nadal successfully defended his title, defeating Dominic Thiem in the final, 6–4, 6–1. It was his record-extending tenth Barcelona Open title.
Nick Kyrgios was the defending champion, but withdrew before the tournament began.
Alexander Zverev was the defending champion and successfully defended his title, defeating Philipp Kohlschreiber in the final, 6–3, 6–3.
John Isner was the defending champion and successfully defended his title, defeating Ryan Harrison in a rematch of the 2017 final, 5–7, 6–3, 6–4.
Juan Martín del Potro was the two-time defending champion but chose not to defend his title.
Zhang Ze was the defending champion but lost in the third round to Bai Yan.
This was the first edition of the tournament.
Dan Evans was the defending champion but chose not to defend his title.