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Gianluca Naso and Walter Trusendi were the defending champions, but Naso chose to not compete this year.
Trusendi partnered with Thomas Fabbiano, but they were eliminated in the quarterfinal by Igor Zelenay and Lovro Zovko.
Daniele Bracciali and Alessandro Motti won in the final 6–4, 6–2, against Amir Hadad and Harel Levy.
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.
David Ferrer is the defending champion. He successfully defended his title by defeating 8th seed Fernando Verdasco, 6–1, 6–2 in the final.
João Sousa was the defending champion but decided to compete at the 2013 Guimarães Open instead.
Michael Linzer and Gerald Melzer were the defending champions, having won the event in 2012, but both players chose not to defend their title.
The 2013 Morocco Tennis Tour – Meknes was a professional tennis tournament played on clay courts. It was the sixth edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Meknes, Morocco between 9 and 15 September 2013.
Gerard Granollers and Jordi Samper Montaña defeated Taro Daniel and Alexander Rumyantsev 6–4, 6–4 to win the inaugural event.
Stanislas Wawrinka was the defending champion, but withdrew before the event started.
Carlos Berlocq won the title, defeating Tomáš Berdych in the final, 0–6, 7–5, 6–1.
Juan Mónaco was the defending champion, but lost to Ivo Karlović in the quarterfinals.
Colin Ebelthite and Rameez Junaid were the defending champions, but decided not to compete.
Alessandro Giannessi and Gianluca Naso were the defending champions. Giannessi did not compete, while Naso partnered Alessio di Mauro, and lost in the first round to Gerard Granollers and Jordi Samper Montaña.
Gerard Granollers and Jordi Samper-Montaña were the defending champions, but they lost in the final to Dino Marcan and Antonio Šančić, 1–6, 6–7(3–7).
Gerard Granollers and Jordi Samper-Montaña were the defending champions, but decided not to compete.
Víctor Estrella Burgos was the defending champion and successfully defended his title, defeating Thomaz Bellucci in the final, 4–6, 7–6(7–5), 6–2.
Andrés Molteni and Guido Pella were the defending champions, but chose not to defend their title.
Roger Federer was the defending champion, but chose not to participate this year.
Hugo Dellien was the defending champion but chose not to defend his title.
Daniel Elahi Galán was the defending champion but lost in the second round to Rogério Dutra Silva.
Federico Delbonis was the defending champion but chose not to defend his title.
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.