Samuel Groth and Toshihide Matsui were the defending champions but decided not to participate.
Jonathan Erlich and Andy Ram were the defending champions, but decided not to participate this year.
Lu Yen-hsun and Jonathan Marray were the defending champions, but Lu chose not to compete this year and Marray chose to compete in Brisbane instead.
Oliver Marach and Fabrice Martin won the title, defeating Austin Krajicek and Benoît Paire in the final, 6–3, 7–5.
Pablo Carreño Busta and Rafael Nadal were the defending champions, but chose not to participate this year.
Sander Arends and Mateusz Kowalczyk were the defending champions but only Arends chose to defend his title, partnering Antonio Šančić.
Jonathan Eysseric and Édouard Roger-Vasselin were the defending champions but only Eysseric chose to defend his title, partnering Andre Begemann. Eysseric successfully defended his title, defeating Tomasz Bednarek and David Pel 6–3, 6–4 in the final.
Santiago González and Artem Sitak were the defending champions but chose not to defend their title.
Jonathan Erlich and Aisam-ul-Haq Qureshi were the defending champions but chose not to participate together. Erlich played alongside James Cerretani, but lost in the first round to Guido Pella and João Sousa. Qureshi teamed up with Santiago González and lost in the semifinals to Ivan Dodig and Mate Pavić.
The 2019 ABN AMRO World Tennis Tournament was a men's tennis tournament played on indoor hard courts. It took place at the Rotterdam Ahoy arena in the Dutch city of Rotterdam, between 11 and 17 February 2019. It was the 46th edition of the Rotterdam Open, and part of the ATP Tour 500 series of the 2019 ATP Tour. The tournament also included a Men's Wheelchair Tennis Singles and Doubles draw, which was an ITF-1 level tournament, with a total of $32,000 prize money.
Ken and Neal Skupski were the defending champions, but lost in the quarterfinals to Benjamin Bonzi and Antoine Hoang.
Jamie Murray and Bruno Soares were the defending champions, but lost in the first round to Robert Lindstedt and Frances Tiafoe.
Feliciano López and Marc López were the defending champions, but chose not to participate together. Feliciano López played alongside Pablo Carreño Busta, but lost in the semifinals to Juan Sebastián Cabal and Robert Farah. Marc López teamed up with Marcel Granollers, but lost in the first round to Raven Klaasen and Joe Salisbury.
Ivan Dodig and Rajeev Ram were the defending champions, but Dodig chose not to participate and Ram chose to compete in Estoril instead.
Oliver Marach and Mate Pavić were the defending champions, and successfully defended their title, defeating Matthew Ebden and Robert Lindstedt in the final, 6–4, 6–4.
Nicholas Monroe and John-Patrick Smith were the defending champions, but chose not to participate together. Monroe played alongside Frances Tiafoe, but lost in the first round to Marcelo Arévalo and Miguel Ángel Reyes-Varela. Smith teamed up with Ben McLachlan but lost in the quarterfinals to Jack Sock and Jackson Withrow.
Sander Gillé and Joran Vliegen were the defending champions but chose not to defend their title.
The men's doubles of the 2020 RPM Open tournament took place on clay in Prague, Czech Republic.
Luca Margaroli and Filip Polášek were the defending champions but chose not to defend their title.
Benjamin Bonzi and Antoine Hoang were the defending champions but only Hoang chose to defend his title, partnering Romain Arneodo. Hoang lost in the quarterfinals to Jonathan Eysseric and Quentin Halys.
Lloyd Glasspool and Harri Heliövaara defeated Rohan Bopanna and Matwé Middelkoop in the final, 6–2, 6–4 to win the men's doubles tennis title at the 2022 Hamburg European Open.
Jérémy Chardy 
Henri Kontinen 
Jean-Julien Rojer 
Horia Tecău 
