| Singles | |
|---|---|
| 2017 Pekao Szczecin Open | |
| Champion |  Richard Gasquet |
| Runner-up |  Florian Mayer |
| Score | 7–6(7–3), 7–6(7–4) |
Alessandro Giannessi was the defending champion but lost in the first round to Artem Smirnov.
Richard Gasquet won the title after defeating Florian Mayer 7–6(7–3), 7–6(7–4) in the final.
Richard Gasquet (champion) Florian Mayer (final)
Alessandro Giannessi (first round)
Carlos Berlocq (first round) Marco Cecchinato (first round)
Jerzy Janowicz (quarterfinals)
Casper Ruud (first round) Renzo Olivo (second round)| Semifinals | Final | ||||||||||||
| 1/WC | Richard Gasquet | 6 | 6 | ||||||||||
 Taro Daniel | 4 | 4 | |||||||||||
| 1/WC | Richard Gasquet | 77 | 77 | ||||||||||
| 2 | Florian Mayer | 63 | 64 | ||||||||||
| SE |  Jürgen Zopp | 7 | 3 | 4 | |||||||||
| 2 | Florian Mayer | 5 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1/WC | R Gasquet | 6 | 6 | ||||||||||||||||||||||||
| WC | M Gawron | 3 | 0 | 1/WC | R Gasquet | 6 | 6 | ||||||||||||||||||||
 B Zapata Miralles | 6 | 6 | B Zapata Miralles | 3 | 2 | ||||||||||||||||||||||
| Q |  Robin Staněk | 2 | 3 | 1/WC | R Gasquet | 4 | 77 | 6 | |||||||||||||||||||
| G Andreozzi | 77 | 6 | G Andreozzi | 6 | 62 | 4 | |||||||||||||||||||||
| WC | K Drzewiecki | 63 | 2 | G Andreozzi | 6 | 6 | |||||||||||||||||||||
| Í Cervantes | 3 | 6 | 6 | Í Cervantes | 3 | 3 | |||||||||||||||||||||
| 5 | M Cecchinato | 6 | 4 | 4 | 1/WC | R Gasquet | 6 | 6 | |||||||||||||||||||
| 4 | C Berlocq | 4 | 62 | T Daniel | 4 | 4 | |||||||||||||||||||||
 B Fratangelo | 6 | 77 | B Fratangelo | 3 | 6 | 6 | |||||||||||||||||||||
| SE |  J Cagnina | 4 | 6 | 6 | SE | J Cagnina | 6 | 2 | 3 | ||||||||||||||||||
| Q | Maxime Tabatruong | 6 | 3 | 2 | B Fratangelo | 3 | 2 | ||||||||||||||||||||
| T Daniel | 6 | 6 | T Daniel | 6 | 6 | ||||||||||||||||||||||
| WC | Adrian Andrzejczuk | 2 | 4 | T Daniel | 7 | 7 | |||||||||||||||||||||
| S Caruso | 6 | 4 | 3 | 8 | R Olivo | 5 | 5 | ||||||||||||||||||||
| 8 | R Olivo | 3 | 6 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | C Ruud | 5 | 77 | 2 | |||||||||||||||||||||||
| SE | J Zopp | 7 | 64 | 6 | SE | J Zopp | 7 | 6 | |||||||||||||||||||
| LL | Marek Jaloviec | 4 | 1 | Y Maden | 5 | 4 | |||||||||||||||||||||
| Y Maden | 6 | 6 | SE | J Zopp | 6 | 4 | 6 | ||||||||||||||||||||
| LL |  A Bury | 3 | 4 | D Brown | 2 | 6 | 4 | ||||||||||||||||||||
| D Brown | 6 | 6 | D Brown | 77 | 4 | 77 | |||||||||||||||||||||
| Q |  A Smirnov | 77 | 6 | Q | A Smirnov | 64 | 6 | 65 | |||||||||||||||||||
| 3 | A Giannessi | 64 | 1 | SE | J Zopp | 7 | 3 | 4 | |||||||||||||||||||
| 6 | J Janowicz | 6 | 6 | 2 | F Mayer | 5 | 6 | 6 | |||||||||||||||||||
| Q | G Durán | 4 | 1 | 6 | J Janowicz | 6 | 77 | ||||||||||||||||||||
| K de Schepper | 7 | 6 | K de Schepper | 1 | 62 | ||||||||||||||||||||||
| O Otte | 5 | 2 | 6 | J Janowicz | 2 | 63 | |||||||||||||||||||||
 G Oliveira | 3 | 6 | 6 | 2 | F Mayer | 6 | 77 | ||||||||||||||||||||
| LL | C Lestienne | 6 | 2 | 3 | G Oliveira | 4 | 4 | ||||||||||||||||||||
| G Sakharov | 7 | 1 | 2 | 2 | F Mayer | 6 | 6 | ||||||||||||||||||||
| 2 | F Mayer | 5 | 6 | 6 | |||||||||||||||||||||||
Marin Čilić was the two-time defending champion; however, he was eliminated by Florian Mayer in the quarterfinals.
Ivan Dodig claimed the first ATP title of his career, by defeating Michael Berrer 6–3, 6–4 in the final match.
Juan Ignacio Chela was the defending champion but was eliminated in the semifinals by Pablo Andújar.
Florian Mayer won the title, defeating Pablo Andújar 6–3, 6–1 in the final.
Gastón Gaudio was the defending champion but lost in the quarterfinals to Richard Gasquet.
Gilles Simon was the defending champion but chose not to participate. Jarkko Nieminen won in the final against Julien Benneteau 6–2, 7–5.
Gaël Monfils was the last champion at the 2010 edition.
Tomáš Berdych won the final 6–2, 4–6, 6–3 against Gaël Monfils.
David Ferrer is the defending champion. He successfully defended his title by defeating 8th seed Fernando Verdasco, 6–1, 6–2 in the final.
Seven-time defending champion Rafael Nadal defeated Novak Djokovic in the final, 6–3, 6–1 to win the singles tennis title at the 2012 Monte-Carlo Masters. Nadal became the first man in the Open Era to win a tournament eight consecutive times. He did not lose a single set in the entire tournament.
Robin Söderling was the defending champion, but withdrew due to illness.
David Ferrer won the title, defeating Nicolás Almagro 6–2, 6–2 in the final.
Gilles Simon was the defending champion, but lost in the second round to Tommy Haas.
Haas went to the final, but lost to Juan Mónaco 5–7, 4–6.
Roger Federer was the defending champion, but lost to Juan Martín del Potro 6–4, 6–7(5–7), 7–6(7–3) in the final.
Roger Federer was the defending champion, but lost in the quarterfinals to Julien Benneteau.
Juan Martín del Potro won the title, defeating Benneteau in the final 7–6(7–2), 6–3.
Marin Čilić was the defending champion, but withdrew with a knee injury before the tournament began.
Tommy Robredo won the title, defeating Fabio Fognini in the final, 6–0, 6–3.
Roger Federer was the defending champion, but chose not to participate this year.
Dominic Thiem was the defending champion, but chose to compete in Rotterdam instead.
Pablo Cuevas was the two-time defending champion and successfully defended his title, defeating Albert Ramos Viñolas in the final, 6–7(3–7), 6–4, 6–4.
Víctor Estrella Burgos was the three-time defending champion and the tournament's only champion to date, but lost in the second round to Gerald Melzer.
Fabio Fognini was the defending champion, but chose not to defend his title.
John Peers and Michael Venus were the defending champions, but Peers chose not to participate this year.
Carlos Alcaraz defeated Richard Gasquet in the final, 6–2, 6–2 to win the singles tennis title at the 2021 Croatia Open. It was his first ATP Tour title. With the victory, Alcaraz became the youngest player to win an ATP Tour title since Kei Nishikori at the 2008 Delray Beach International Tennis Championships.
Gastão Elias was the two-time defending champion and successfully defended his title, defeating Alessandro Giannessi 7–6(7–4), 6–1 in the final.