Tommy Haas was the defending champion, but could not participate this year due to a shoulder injury.
Two-time defending champion Novak Djokovic defeated Andy Murray in the final, 6–2, 6–4 to win the singles tennis title at the 2015 Paris Masters. It was his record fourth Paris Masters title. With the win, Djokovic became the first man to win six Masters 1000 titles in the same year.
Andy Murray defeated Roberto Bautista Agut in the final, 7−6(7−1), 6−1 to win the singles tennis title at the 2016 Shanghai Masters. It was his third Shanghai Masters and 13th Masters 1000 title overall.
Andy Murray defeated Fernando Verdasco in the final, 6–3, 6–2 to win the men's singles tennis title at the 2017 Dubai Tennis Championships. Murray saved seven match points en route to the title, against Philipp Kohlschreiber in the quarterfinals. He won the second set tiebreak of that match with a score of 20–18, equaling the record of the longest tiebreak in history, until the record was broken in 2022.
The 2018 Geneva Open was a men's tennis tournament played on outdoor clay courts. It was the 16th edition of the Geneva Open and part of the ATP World Tour 250 series of the 2018 ATP World Tour. It took place at the Tennis Club de Genève in Geneva, Switzerland, from May 20 through May 26, 2018.
Alexander Zverev defeated Nicolás Jarry in the final, 6–3, 3–6, 7–6(10–8) to win the singles tennis title at the 2019 Geneva Open. Zverev saved two championship points en route to the title, in the final-set tiebreak.
Jaume Munar was the defending champion but chose not to defend his title.
The men's singles of the 2019 Advantage Cars Prague Open tournament was played on clay in Prague, Czech Republic.
Ričardas Berankis was the defending champion but chose not to defend his title.
Grégoire Barrère was the defending champion but chose not to defend his title.
Gaël Monfils was the defending champion and successfully defended his title, defeating Félix Auger-Aliassime in the final, 6–2, 6–4.
Andrey Rublev defeated Márton Fucsovics in the final, 7–6(7–4), 6–4 to capture the men's singles tennis title at the 2021 Rotterdam Open. It was Rublev's fourth consecutive ATP Tour 500 victory, dating back to the 2020 Hamburg Open.
Aslan Karatsev won his first ATP Tour singles title, defeating Lloyd Harris in the final, 6–3, 6–2 to win the men's singles tennis title at the 2021 Dubai Tennis Championships. Karatsev became the second wildcard in the tournament's history to win the men's singles title. Harris was the first qualifier to reach the final of the Dubai Tennis Championships.
Pablo Carreño Busta defeated Jaume Munar in the final, 6–1, 2–6, 6–4 to win the inaugural Men's Singles tennis title at the 2021 Andalucía Open. Notably, this was the first tournament in ATP history to feature 4 semifinalists from the same nation.
Hubert Hurkacz was the reigning champion from when the tournament was last held in 2019, but chose not to participate this year.
Félix Auger-Aliassime defeated Stefanos Tsitsipas in the final, 6–4, 6–2. It was his maiden ATP Tour singles title, following eight runner-up finishes in prior finals.
Defending champion Stefanos Tsitsipas defeated Alejandro Davidovich Fokina in the final, 6–3, 7–6(7–3) to win the singles tennis title at the 2022 Monte-Carlo Masters. He became the sixth player to win consecutive titles at the Monte-Carlo Masters in the Open Era. The win also earned him his second Masters 1000 title and his eighth career singles title overall.
Sebastián Báez defeated Frances Tiafoe in the final, 6–3, 6–2 to win the singles tennis title at the 2022 Estoril Open. It was his maiden ATP Tour title.
Félix Auger-Aliassime defeated Holger Rune in the final, 6–3, 7–5 to win the singles tennis title at the 2022 Swiss Indoors. It was his third title in as many weeks and fourth career ATP Tour singles title overall.
Nicolás Jarry defeated Grigor Dimitrov in the final, 7–6(7–1), 6–1 to win the singles tennis title at the 2023 Geneva Open.
Márton Fucsovics 
Peter Gojowczyk 
