Lleyton Hewitt was the defending champion, but lost to Philipp Kohlschreiber in the quarterfinals.
Kohlschreiber won the tournament, defeating Philipp Petzschner in an all-German final, the first in the tournament's history, after Petzschner retired in the second set at a score of 7–6, 2–0.
Andy Murray defeated Novak Djokovic in the final, 6–4, 4–6, 6–3, to win the men's singles tennis title at the 2015 Canadian Open. It was Murray's first win against Djokovic since the 2013 Wimbledon final, having lost eight consecutive matches to him in that span.
Stan Wawrinka defeated Marcos Baghdatis in the final, 6–4, 7–6(15–13) to win the men's singles tennis title at the 2016 Dubai Tennis Championships.
Novak Djokovic defeated the defending champion Andy Murray in the final, 6–2, 3–6, 6–3, to win the men's singles tennis title at the 2016 Madrid Open. It was Djokovic's second title in Madrid and his record 29th ATP Masters 1000 title.
Andy Murray defeated the two-time defending champion Novak Djokovic in the final, 6–3, 6–3 to win the men's singles tennis title at the 2016 Italian Open.
Milos Raonic was the defending champion, but lost in the second round to Mikhail Youzhny.
Roger Federer defeated Rafael Nadal in the final, 6–4, 3–6, 6–1, 3–6, 6–3 to win the men's singles tennis title at the 2017 Australian Open. It was his fifth Australian Open title and record-extending 18th major title overall. Federer became the oldest men's singles major champion since Ken Rosewall at the 1972 Australian Open. Nadal was attempting to become the first man in the Open Era to achieve a double career Grand Slam.
Andy Murray defeated John Isner in the final, 6–3, 6–7(4–7), 6–4 to win the singles tennis title at the 2016 Paris Masters. By reaching the final, Murray secured the world No. 1 ranking for the first time in his career.
Roger Federer defeated Rafael Nadal in the final, 6–3, 6–4 to win the men's singles tennis title at the 2017 Miami Open. It was Federer's third Miami Open title, and he claimed his third Sunshine Double with the win. Federer saved two match points en route to the title, in the quarterfinals against Tomáš Berdych. It was Nadal's fifth runner-up finish without winning the title.
Rafael Nadal defeated Dominic Thiem in the final, 7–6(10–8), 6–4 to win the men's singles tennis title at the 2017 Madrid Open. It was his record fifth Madrid Open title and record-equaling 30th Masters singles title.
Alexander Zverev defeated Roger Federer in the final, 6–3, 6–4 to win the men's singles tennis title at the 2017 Canadian Open. Zverev saved three match points en route to the title, in his second-round match against Richard Gasquet.
Grigor Dimitrov defeated Nick Kyrgios in the final, 6–3, 7–5 to win the men's singles tennis title at the 2017 Cincinnati Masters. It was his first Masters 1000 title, and he did not lose a set en route.
Two-time defending champion Rafael Nadal defeated Kei Nishikori in the final, 6–3, 6–2 to win the singles tennis title at the 2018 Monte-Carlo Masters. It was his record-extending 11th Monte-Carlo Masters title and his record 31st Masters title. By winning the title, Nadal also retained the ATP no. 1 singles ranking. He did not lose a single set during the tournament.
Alexander Zverev defeated Dominic Thiem in the final, 6–4, 6–4 to win the men's singles tennis title at the 2018 Madrid Open. He did not lose a set and did not have his serve broken throughout the entire tournament.
The 2018 MercedesCup was a men's tennis tournament played on outdoor grass courts. It was the 41st edition of the Stuttgart Open, and part of the ATP World Tour 250 series of the 2018 ATP World Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 11 June until 17 June 2018. First-seeded Roger Federer regained the ATP no. 1 singles ranking by reaching the final.
Borna Ćorić defeated the defending champion Roger Federer in the final, 7–6(8–6), 3–6, 6–2 to win the singles tennis title at the 2018 Halle Open. It was his first ATP 500 title. With Federer's loss, Rafael Nadal regained the world No. 1 ranking.
Roger Federer was the defending champion, but chose not to participate this year.
Dominic Thiem defeated Roger Federer in the final, 3–6, 6–3, 7–5 to win the men's singles tennis title at the 2019 Indian Wells Masters. It was his maiden ATP Tour Masters 1000 title, and he became the first Austrian to win a Masters title since Thomas Muster won the 1997 Miami Open.
Roger Federer defeated the defending champion John Isner in the final, 6–1, 6–4 to win the men's singles tennis title at the 2019 Miami Open. It was Federer's fourth Miami Open title, his 28th and final Masters singles title, and his 101st career singles title overall.
Roger Federer was the defending champion, but chose not to participate this year.
Roger Federer 
Milos Raonic 
