Gilles Simon was the defending champion, but lost in the first round to Teymuraz Gabashvili.
Jo-Wilfried Tsonga was the defending champion, but withdrew with a left knee injury before the tournament began.
This was the first edition of the tournament.
Richard Gasquet was the two-time defending champion, but lost to Alexander Zverev in the final, 6–7(4–7), 3–6.
Nick Kyrgios was the defending champion, but lost in the semifinals to Jo-Wilfried Tsonga.
Lucas Pouille defeated Feliciano López in the final, 4–6, 7–6(7–5), 6–4 to win the singles tennis title at the 2017 Stuttgart Open. Pouille saved a match point en route to the title, in the second round against Jan-Lennard Struff.
Fabio Fognini was the defending champion, but lost in the quarterfinals to lucky loser Andrey Rublev.
The 2017 Moselle Open was a tennis tournament held in Metz, France and played on indoor hard courts. It was the 15th edition of the Moselle Open, and part of the ATP World Tour 250 series of the 2017 ATP World Tour. It was held at the Arènes de Metz from 18 September to 24 September 2017. Unseeded Peter Gojowczyk, who entered the main draw as a qualifier, won the singles title.
Richard Gasquet was the defending champion but withdrew before the tournament began.
Julien Benneteau was the defending champion but chose not to defend his title.
The 2018 Open Sud de France was a men's tennis tournament played on indoor hard courts. It was the 31st edition of the Open Sud de France, and part of the ATP World Tour 250 Series of the 2018 ATP World Tour. It took placed at the Arena Montpellier in Montpellier, France, from February 5 to February 11, 2018.
Alexander Zverev was the defending champion, but chose not to participate this year.
Jo-Wilfried Tsonga was the defending champion, but withdrew before the tournament began.
Andy Murray was the defending champion, but could not participate this year as he was recovering from hip surgery.
Alexander Zverev was the defending champion and successfully defended his title, defeating Alex de Minaur in the final, 6–2, 6–4.
Peter Gojowczyk was the defending champion, but lost to Kei Nishikori in the second round.
Karen Khachanov defeated Novak Djokovic in the final, 7–5, 6–4 to win the singles tennis title at the 2018 Paris Masters. It was Khachanov's first Masters 1000 title, and he saved two match points en route, in his third round match against John Isner.
Roger Federer was the defending champion, but chose not to participate this year.
Nick Kyrgios defeated Daniil Medvedev in the final, 7–6(8–6), 7–6(7–4) to win the men's singles tennis title at the 2019 Washington Open. Kyrgios saved a match point in the semifinals against Stefanos Tsitsipas.
Gilles Simon was the defending champion, but lost in the second round to Aljaž Bedene.
Peter Gojowczyk 
Benoît Paire 
