| Doubles | |
|---|---|
| 2021 TK Sparta Prague Open | |
| Champions |  Jonáš Forejtek Michael Vrbenský |
| Runners-up |  Evgeny Karlovskiy Evgenii Tiurnev |
| Score | 6–1, 6–4 |
Tomasz Bednarek and Nikola Mektić were the defending champions [1] but chose not to defend their title.
Jonáš Forejtek and Michael Vrbenský won the title after defeating Evgeny Karlovskiy and Evgenii Tiurnev 6–1, 6–4 in the final.
Sriram Balaji / Arjun Kadhe (first round)
Gonçalo Oliveira / 
Nino Serdarušić (semifinals)
Carlos Gómez-Herrera / 
Mark Vervoort (quarterfinals)
Facundo Mena / Camilo Ugo Carabelli (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | S Balaji A Kadhe | 4 | 4 | ||||||||||||||||||||||||
| Alt | Yan Bondarevskiy O Prihodko | 6 | 6 | Alt | Y Bondarevskiy O Prihodko | 3 | 6 | [6] | |||||||||||||||||||
| WC | A Paulson Robin Staněk | 3 | 6 | [4] |  F Baldi M Bortolotti | 6 | 3 | [10] | |||||||||||||||||||
| F Baldi M Bortolotti | 6 | 2 | [10] | F Baldi M Bortolotti | |||||||||||||||||||||||
| 4 | F Mena C Ugo Carabelli | 6 | 7 | E Karlovskiy E Tiurnev | w/o | ||||||||||||||||||||||
| WC | Martin Krumich D Svrčina | 3 | 5 | 4 | F Mena C Ugo Carabelli | 4 | 5 | ||||||||||||||||||||
| E Karlovskiy E Tiurnev | 6 | 7 | E Karlovskiy E Tiurnev | 6 | 7 | ||||||||||||||||||||||
| I Sijsling G Smits | 3 | 5 | E Karlovskiy E Tiurnev | 1 | 4 | ||||||||||||||||||||||
| J Forejtek M Vrbenský | 6 | 6 | J Forejtek M Vrbenský | 6 | 6 | ||||||||||||||||||||||
| WC | Victor Sklenka Kryštof Zapský | 3 | 2 | J Forejtek M Vrbenský | 6 | 7 | |||||||||||||||||||||
R Bonadio  E Furness | 4 | 3 | 3 | C Gómez-Herrera M Vervoort | 3 | 5 | |||||||||||||||||||||
| 3 | C Gómez-Herrera M Vervoort | 6 | 6 | J Forejtek M Vrbenský | 6 | 77 | |||||||||||||||||||||
F Agamenone  P Matuszewski | 4 | 66 | 2 | G Oliveira N Serdarušić | 1 | 64 | |||||||||||||||||||||
 U Ignatik  FC Jianu | 6 | 78 | U Ignatik FC Jianu | 3 | 4 | ||||||||||||||||||||||
 A Andreev M Gengel | 65 | 64 | 2 | G Oliveira N Serdarušić | 6 | 6 | |||||||||||||||||||||
| 2 | G Oliveira N Serdarušić | 77 | 77 | ||||||||||||||||||||||||
Martina Hingis defeated Amanda Coetzer in the final, 6–2, 6–1 to win the singles tennis title at the 1999 Pan Pacific Open.
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.
Juan Carlos Ferrero was the defending champion; however, he chose not to defend his title due to knee and wrist injuries.
Nicolás Almagro claimed the title by defeating Alexandr Dolgopolov 6–3, 7–6(3) in the final.
Yevgeny Kafelnikov was the defending champion and defended his title with 6–4, 6–4 against Magnus Larsson.
James Blake was the defending champion and successfully defended his title, beating Jarkko Nieminen 6–4, 6–2 in the final.
David Marrero and Fernando Verdasco were the defending champions but decided not to participate.
Simone Bolelli and Fabio Fognini won the title, defeating Nicholas Monroe and Simon Stadler in the final, 6–3, 6–2.
Anastasia Pavlyuchenkova and Lucie Šafářová were the defending champions, but Pavlyuchenkova chose not to participate this year.
Šafářová played alongside Kristina Mladenovic and successfully defended the title, defeating Andrea Hlaváčková and Liezel Huber in the final 6–3, 7–6(8–6).
Jay Andrijic and Bradley Mousley were the defending champions, but Andrijic was no longer eligible to participate.
Mousley successfully defended the title with Lucas Miedler, defeating Quentin Halys and Johan-Sébastien Tatlot in the final, 6–4, 6–3.
Jonas Björkman and Max Mirnyi were the defending champions and successfully defended their title, defeating Bob and Mike Bryan 3–6, 6–3, [10–7] in the final.
Mahesh Bhupathi and Max Mirnyi defeated defending champions Wayne Arthurs and Paul Hanley 2–6, 6–3, 6–4 in the final. It was the 34th title for Bhupathi and the 20th title for Mirnyi in their respective careers.
Li Ting and Sun Tiantian were the defending champions and successfully defended their title, by defeating Gisela Dulko and María Sánchez Lorenzo 6–2, 6–2 in the final.
Kim Clijsters was the defending champion, and successfully defended her title by defeating compatriot Justine Henin-Hardenne 5–7, 6–4, 6–2 in the final.
Fabiola Zuluaga was the defending champion and successfully defended her title, by defeating Anabel Medina Garrigues 6–3, 6–2 in the final.
Pierre-Hugues Herbert and Nicolas Mahut were the defending champions but chose not to defend their title.
Justine Henin-Hardenne was the defending champion and successfully defended her title, by defeating Svetlana Kuznetsova 7–6(7–3), 6–3 in the final.
Oliver Marach and Mate Pavić were the defending champions, but chose not to defend their title.
Bethanie Mattek-Sands and Jamie Murray were the defending champions and successfully defended their title, defeating Chan Hao-ching and Michael Venus in the final, 6–2, 6–3. This is the third straight Mixed Doubles title Murray has won at the US Open, following his championships in 2018 and 2017.
Todd Martin was the defending champion and successfully defended his title, by defeating Paul Haarhuis 7–6(7–2), 6–4 in the final.
Jacco Eltingh and Paul Haarhuis were the defending champions, but Eltingh did not compete this year.
Javier Frana and Jim Pugh were the defending champions, but Frana did not compete this year.