| Singles | |
|---|---|
| 2023 Monterrey Challenger | |
| Champion |  Nuno Borges |
| Runner-up |  Borna Gojo |
| Score | 6–4, 7–6(8–6) |
Fernando Verdasco was the defending champion [1] but chose not to defend his title.
Nuno Borges won the title after defeating Borna Gojo 6–4, 7–6(8–6) in the final.
Adrian Mannarino (first round)
Emilio Gómez (second round)
Denis Kudla (quarterfinals)
Daniel Altmaier (quarterfinals) Christopher Eubanks (first round) Nuno Borges (champion)
Taro Daniel (second round) Yosuke Watanuki (semifinals)| Semifinals | Final | ||||||||||||
| Borna Gojo | 77 | 6 | |||||||||||
| 8 | Yosuke Watanuki | 65 | 4 | ||||||||||
| Borna Gojo | 4 | 66 | |||||||||||
| 6 | Nuno Borges | 6 | 78 | ||||||||||
| 6 | Nuno Borges | 77 | 77 | ||||||||||
| Mitchell Krueger | 63 | 63 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Mannarino | 5 | 64 | ||||||||||||||||||||||||
| A Kovacevic | 7 | 77 | A Kovacevic | 6 | 6 | ||||||||||||||||||||||
 N Mejía | 6 | 1 | 6 | N Mejía | 3 | 2 | |||||||||||||||||||||
 S Mansouri | 4 | 6 | 3 | A Kovacevic | 65 | 6 | 2 | ||||||||||||||||||||
| B Gojo | 6 | 77 | B Gojo | 77 | 3 | 6 | |||||||||||||||||||||
| WC |  R Pacheco Méndez | 3 | 63 | B Gojo | 6 | 6 | |||||||||||||||||||||
| S Johnson | 4 | 6 | 3 | 7 | T Daniel | 2 | 4 | ||||||||||||||||||||
| 7 | T Daniel | 6 | 3 | 6 | B Gojo | 77 | 6 | ||||||||||||||||||||
| 3 | D Kudla | 6 | 6 | 8 | Y Watanuki | 65 | 4 | ||||||||||||||||||||
 M Bellucci | 2 | 4 | 3 | D Kudla | 6 | 6 | |||||||||||||||||||||
| Q | N Chappell | 6 | 6 | Q | N Chappell | 3 | 4 | ||||||||||||||||||||
| Q |  J Flores | 3 | 2 | 3 | D Kudla | 6 | 63 | 2 | |||||||||||||||||||
| WC | E Escobedo | 6 | 2 | 2 | 8 | Y Watanuki | 3 | 77 | 6 | ||||||||||||||||||
| B Paire | 2 | 6 | 6 | B Paire | 62 | 1 | |||||||||||||||||||||
| WC | James Van Deinse | 0 | 1 | 8 | Y Watanuki | 77 | 6 | ||||||||||||||||||||
| 8 | Y Watanuki | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | N Borges | 6 | 6 | ||||||||||||||||||||||||
| PR | B Klahn | 2 | 2 | 6 | N Borges | 6 | 6 | ||||||||||||||||||||
| Q | E Zhu | 77 | 5 | 6 | Q | E Zhu | 2 | 4 | |||||||||||||||||||
 T-l Wu | 62 | 7 | 4 | 6 | N Borges | 77 | 6 | ||||||||||||||||||||
| M Marterer | 6 | 6 | 4 | D Altmaier | 62 | 4 | |||||||||||||||||||||
| G Elias | 3 | 4 | M Marterer | 61 | 3 | ||||||||||||||||||||||
| B Holt | 64 | 3 | 4 | D Altmaier | 77 | 6 | |||||||||||||||||||||
| 4 | D Altmaier | 77 | 6 | 6 | N Borges | 77 | 77 | ||||||||||||||||||||
| 5 | C Eubanks | 4 | 3 | M Krueger | 63 | 63 | |||||||||||||||||||||
| Q |  G Andreozzi | 6 | 6 | Q | G Andreozzi | 3 | 1r | ||||||||||||||||||||
| M Krueger | 6 | 5 | 6 | M Krueger | 6 | 2 | |||||||||||||||||||||
 S Diez | 4 | 7 | 4 | M Krueger | 6 | 2 | |||||||||||||||||||||
| Q |  B Tomic | 77 | 6 | Q | B Tomic | 4 | 1r | ||||||||||||||||||||
| JP Ficovich | 63 | 1 | Q | B Tomic | 4 | 6 | 77 | ||||||||||||||||||||
| Q |  D Yevseyev | 66 | 4 | 2 | E Gómez | 6 | 4 | 64 | |||||||||||||||||||
| 2 | E Gómez | 78 | 6 | ||||||||||||||||||||||||
Mario Ančić was the defending champion, but lost in the second round to Mikhail Youzhny.
Carlos Moyá was the defending champion, but lost in the quarterfinals to Fabio Fognini.
Four-time defending champion Rafael Nadal successfully defended his title, defeating David Ferrer in a rematch of the previous year's final, 6–2, 7–5, to win the singles title at the 2009 Barcelona Open. It was his record-extending fifth title at the Barcelona Open.
Five-time defending champion Rafael Nadal defeated Fernando Verdasco in the final, 6–0, 6–1 to win the singles tennis title at the 2010 Monte-Carlo Masters. It was his first title in 11 months, and he lost only 14 games and no sets en route to the title.
Fernando Verdasco defeated Robin Söderling in the final, 6–3, 4–6, 6–3, to claim his first Barcelona Open title.
Albert Montañés was the defending champion, but chose to compete in the Serbia Open instead.
Juan Martín del Potro defeated Fernando Verdasco 6–2, 6–2 to claim his 2nd title this year since rehabilitating from wrist surgery, and his first on clay in nearly three years. It was Del Potro's ninth career title.
Nicolás Almagro was the defending champion, but lost in the semifinals to Fernando Verdasco.
Nicolás Almagro defended his title by defeating Filippo Volandri 6–3, 4–6, 6–4 in the final.
David Ferrer is the defending champion. He successfully defended his title by defeating 8th seed Fernando Verdasco, 6–1, 6–2 in the final.
Robert Lindstedt and Horia Tecău were the three-time defending champions, but chose not to compete together. Tecău teamed up with Marius Copil, but they lost in the first round to Jan Hájek and Filip Polášek. Lindstedt played alongside Daniel Nestor, but they lost in the second round to Nicholas Monroe and Simon Stadler.
Monroe and Stadler went on to win the title, defeating Carlos Berlocq and Albert Ramos in the final, 6–2, 3–6, [10–3]
Leander Paes and Radek Štěpánek were the defending champions, but Štěpánek chose not to compete. Paes played alongside Daniel Nestor, but lost in the second round to Robert Lindstedt and Vasek Pospisil.
Ivan Dodig and Marcelo Melo won the title, defeating David Marrero and Fernando Verdasco in the final, 7–6(7–2), 6–7(6–8), [10–2].
Bob Bryan and Mike Bryan were the defending champions, but lost to Daniel Nestor and Nenad Zimonjić in the semifinals.
Nestor and Zimonjić went on to win the title, defeating Robin Haase and Feliciano López in the final, 6–4, 7–6(7–2).
Bob and Mike Bryan were the defending champions and successfully defended the title, defeating Vasek Pospisil and Jack Sock in the final, 6–3, 6–2.
Albert Ramos Viñolas was the defending champion, but lost in the quarterfinals to Fernando Verdasco.
Dominic Thiem was the defending champion, but lost in the quarterfinals to Fernando Verdasco.
Leonardo Mayer was the defending champion, but lost in the final to Nikoloz Basilashvili, 4–6, 6–0, 5–7. This was Basilashvili's first ATP World Tour title, as well as the first ATP title won by a Georgian player since Alexander Metreveli.
Mirza Bašić was the defending champion but lost in the first round to Martin Kližan.
Matteo Berrettini was the defending champion, but withdrew with an ankle injury before the tournament began.
Benjamin Bonzi was the defending champion but chose not to defend his title.
Holger Rune was the defending champion but chose not to defend his title.