| Singles | |
|---|---|
| 2017 Open de Rennes | |
| Champion |  Uladzimir Ignatik |
| Runner-up |  Andrey Rublev |
| Final score | 6–7(6–8), 6–3, 7–6(7–5) |
Malek Jaziri was the defending champion but chose not to defend his title.
Uladzimir Ignatik won the title after defeating Andrey Rublev 6–7(6–8), 6–3, 7–6(7–5) in the final.
Jérémy Chardy (first round) Paul-Henri Mathieu (quarterfinals)
Jozef Kovalík (second round)
Sergiy Stakhovsky (second round)
Guido Andreozzi (second round)
Lukáš Rosol (second round) Evgeny Donskoy (first round, retired)
Tobias Kamke (second round)| Semifinals | Final | ||||||||||||
| Andrey Rublev | 77 | 7 | |||||||||||
| PR |  Blaž Kavčič | 65 | 5 | ||||||||||
| Andrey Rublev | 78 | 3 | 65 | ||||||||||
| LL | Uladzimir Ignatik | 66 | 6 | 77 | |||||||||
| Mathias Bourgue | 4 | 4 | |||||||||||
| LL | Uladzimir Ignatik | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Chardy | 4 | 612 | ||||||||||||||||||||||||
| A Rublev | 6 | 714 | A Rublev | 6 | 79 | ||||||||||||||||||||||
| G Žemlja | 6 | 78 | G Žemlja | 4 | 67 | ||||||||||||||||||||||
| WC | E Furness | 4 | 66 | A Rublev | 6 | 3 | 6 | ||||||||||||||||||||
| D Brands | 5 | 4 |  D-h Lee | 4 | 6 | 4 | |||||||||||||||||||||
| D-h Lee | 7 | 6 | D-h Lee | 6 | 4 | 6 | |||||||||||||||||||||
| Q |  E Corrie | 6 | 2 | 3 | 6 | L Rosol | 3 | 6 | 2 | ||||||||||||||||||
| 6 | L Rosol | 4 | 6 | 6 | A Rublev | 77 | 7 | ||||||||||||||||||||
| 4 | S Stakhovsky | 6 | 5 | 6 | PR | B Kavčič | 65 | 5 | |||||||||||||||||||
| Q | R Boutillier | 3 | 7 | 2 | 4 | S Stakhovsky | 4 | 77 | 64 | ||||||||||||||||||
| PR | B Kavčič | 4 | 6 | 6 | PR | B Kavčič | 6 | 62 | 77 | ||||||||||||||||||
| Q |  J Zopp | 6 | 1 | 4 | PR | B Kavčič | 77 | 3 | 7 | ||||||||||||||||||
| WC | G Blancaneaux | 5 | 3 | V Millot | 65 | 6 | 5 | ||||||||||||||||||||
| V Millot | 7 | 6 | V Millot | 77 | 4 | 6 | |||||||||||||||||||||
 S Napolitano | 6 | 3 | 4 | 5 | G Andreozzi | 64 | 6 | 2 | |||||||||||||||||||
| 5 | G Andreozzi | 2 | 6 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | E Donskoy | 1r | |||||||||||||||||||||||||
| K de Schepper | 4 | K de Schepper | 4 | 3 | |||||||||||||||||||||||
| WC | T Lamasine | 65 | 710 | 0 | T Gabashvili | 6 | 6 | ||||||||||||||||||||
| T Gabashvili | 77 | 68 | 6 | T Gabashvili | 1 | 65 | |||||||||||||||||||||
| M Bourgue | 6 | 64 | 7 | M Bourgue | 6 | 77 | |||||||||||||||||||||
 R Bemelmans | 4 | 77 | 5 | M Bourgue | 77 | 6 | |||||||||||||||||||||
| WC | M Janvier | 3 | 5 | 3 | J Kovalík | 65 | 4 | ||||||||||||||||||||
| 3 | J Kovalík | 6 | 7 | M Bourgue | 4 | 4 | |||||||||||||||||||||
| 8 | T Kamke | 77 | 4 | 6 | LL | U Ignatik | 6 | 6 | |||||||||||||||||||
 M Fucsovics | 63 | 6 | 4 | 8 | T Kamke | 4 | 65 | ||||||||||||||||||||
| LL | U Ignatik | 6 | 77 | LL | U Ignatik | 6 | 77 | ||||||||||||||||||||
 S Diez | 2 | 65 | LL | U Ignatik | 6 | 6 | |||||||||||||||||||||
| A De Greef | 5 | 6 | 6 | 2 | P-H Mathieu | 4 | 4 | ||||||||||||||||||||
| N Gombos | 7 | 3 | 3 | A De Greef | 77 | 4 | 5 | ||||||||||||||||||||
| Q |  S Tsitsipas | 3 | 6 | 3 | 2 | P-H Mathieu | 61 | 6 | 7 | ||||||||||||||||||
| 2 | P-H Mathieu | 6 | 3 | 6 | |||||||||||||||||||||||
Defending champion Pete Sampras successfully defended his title, defeating Goran Ivanišević in the final, 7–6(7–2), 7–6(7–5), 6–0 to win the gentlemen's singles tennis title at the 1994 Wimbledon Championships.
Defending champion Rafael Nadal successfully defended his title, defeating Roger Federer in the final, 1–6, 6–1, 6–4, 7–6(7–4), to win the men's singles tennis title at the 2006 French Open. It was Nadal's second French Open title and second major title overall. It was the first of three consecutive years Nadal and Federer would contest the French Open final. This marked Federer's first defeat in a major final; he had the chance to become the first man since Rod Laver in 1969 to hold all four major titles at once, having won the preceding Wimbledon, US Open and Australian Open titles. This feat would ultimately be achieved a decade later by Novak Djokovic, at the same tournament, who here reached the quarterfinals at a major for the first time.
Defending champion Pete Sampras successfully defended his title, defeating Goran Ivanišević in the final, 6–7(2–7), 7–6(11–9), 6–4, 3–6, 6–2 to win the gentlemen's singles tennis title at the 1998 Wimbledon Championships. With the win, Sampras equalled Björn Borg's Open Era record of five Wimbledon titles.
Defending champion Rafael Nadal successfully defended his title, defeating Roger Federer in the final 6–2, 6–7(2–7), 6–3, 7–6(7–5), to win the singles title at the 2006 Monte Carlo Masters.
Anabel Medina Garrigues was the defending champion, but retired in the second round against Kristina Barrois.
The 1999 Open Gaz de France singles was the singles event of the seventh edition of the Open GDF Suez; a WTA Tier II tournament held in Paris, France. Mary Pierce was the defending champion but did not compete that year.
Greg Rusedski was the defending champion. Rusedski successfully defended his title, beating Vincent Spadea in the final, 7–6(7–3), 2–6, 6–4.
Andy Roddick was the defending champion, but he retired from professional tennis in September 2012. Feliciano López won the title beating in the final Gilles Simon, 7–6(7–2), 6–7(5–7), 6–0 for the third title of his career, first since 2010.
Andy Roddick did not defend his title as he had retired from professional tennis in September 2012.
Kei Nishikori was the defending champion and successfully defended his title, defeating Ivo Karlović in the final, 6–4, 7–6(7–0).
Feliciano López was the defending champion and successfully defended the title, defeating Richard Gasquet in the final, 6–3, 6–7(5–7), 7–5.
Roger Federer was the two-time defending champion and successfully defended his title, defeating Andreas Seppi in the final, 7–6(7–1), 6–4.
Viktor Troicki was the defending champion and successfully defended his title, defeating Grigor Dimitrov in the final, 2–6, 6–1, 7–6(9–7).
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.
Pablo Cuevas was the defending champion and successfully defended his title, defeating Pablo Carreño Busta in the final, 7–6(7–4), 6–3.
Tomáš Berdych was the defending champion and successfully defended his title, defeating Richard Gasquet in the final, 7−6(7−5), 6−7(2−7), 6−3.
Tomáš Berdych was the two-time defending champion, but withdrew before the competition began.
Wang Qiang was the defending champion, but lost in the first round to Peng Shuai.
Bernard Tomic was the defending champion, but retired in the first round of the qualifying tournament against Denis Istomin.
Cristian Garín defeated Facundo Bagnis in the final, 6–4, 6–7(3–7), 7–5 to capture the men's singles tennis title at the 2021 Chile Open.