| Doubles | |
|---|---|
| 1989 Cincinnati Open | |
| Champions |  Ken Flach Robert Seguso |
| Runners-up |  Pieter Aldrich Danie Visser |
| Final score | 6–4, 6–4 |
Rick Leach and Jim Pugh were the defending champions but only Leach competed that year with Laurie Warder.
Leach and Warder lost in the quarterfinals to Pieter Aldrich and Danie Visser.
Ken Flach and Robert Seguso won in the final 6–4, 6–4 against Aldrich and Visser.
John Fitzgerald / 
Anders Järryd (quarterfinals) Jim Grabb / Patrick McEnroe (quarterfinals) Ken Flach / Robert Seguso (champions) Rick Leach / Laurie Warder (quarterfinals) Mark Kratzmann / Wally Masur (second round) Pieter Aldrich / Danie Visser (final) Jim Courier / Pete Sampras (semifinals)
Carlos di Laura / 
Javier Frana (semifinals)| Semifinals | Final | ||||||||||||
| 8 | Carlos di Laura Javier Frana | 6 | 2 | ||||||||||
| 3 | Ken Flach Robert Seguso | 7 | 6 | ||||||||||
| 3 | Ken Flach Robert Seguso | 6 | 6 | ||||||||||
| 6 | Pieter Aldrich Danie Visser | 4 | 4 | ||||||||||
| 6 | Pieter Aldrich Danie Visser | 7 | 6 | ||||||||||
| 7 | Jim Courier Pete Sampras | 6 | 3 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Fitzgerald A Järryd | 6 | 6 | ||||||||||||||||||||||||
 A Olhovskiy A Volkov | 3 | 3 | 1 | J Fitzgerald A Järryd | 6 | 6 | |||||||||||||||||||||
| A Cherkasov A Chesnokov | 7 | 4 | 4 | R Phillips S Salumaa | 2 | 1 | |||||||||||||||||||||
| R Phillips S Salumaa | 6 | 6 | 6 | 1 | J Fitzgerald A Järryd | 6 | 2 | 3 | |||||||||||||||||||
| C Eagle B Moir | 4 | 3 | 8 | C di Laura J Frana | 3 | 6 | 6 | ||||||||||||||||||||
 A Gómez M Wilander | 6 | 6 | A Gómez M Wilander | 6 | 3 | 0 | |||||||||||||||||||||
| R Baxter L Scott | 5 | 5 | 8 | C di Laura J Frana | 1 | 6 | 6 | ||||||||||||||||||||
| 8 | C di Laura J Frana | 7 | 7 | 8 | C di Laura J Frana | 6 | 2 | ||||||||||||||||||||
| 3 | K Flach R Seguso | 5 | 6 | 6 | 3 | K Flach R Seguso | 7 | 6 | |||||||||||||||||||
 A Moreno J Yzaga | 7 | 4 | 4 | 3 | K Flach R Seguso | 4 | 7 | 6 | |||||||||||||||||||
| M De Palmer G Van Emburgh | 3 | 3 | M Anger R Van't Hof | 6 | 6 | 1 | |||||||||||||||||||||
| M Anger R Van't Hof | 6 | 6 | 3 | K Flach R Seguso | 1 | ||||||||||||||||||||||
 M Knowles  M Ruah | 3 | 2 |  N Broad G Muller | 2r | |||||||||||||||||||||||
| N Broad G Muller | 6 | 6 | N Broad G Muller | 7 | 6 | ||||||||||||||||||||||
R Matuszewski  M Schapers | 2 | 2 | 5 | M Kratzmann W Masur | 6 | 3 | |||||||||||||||||||||
| 5 | M Kratzmann W Masur | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | P Aldrich D Visser | 6 | 6 | 6 | |||||||||||||||||||||||
| C Bailey B Scanlon | 3 | 7 | 3 | 6 | P Aldrich D Visser | 6 | 7 | ||||||||||||||||||||
 M Nido M Robertson | 7 | 6 | M Nido M Robertson | 2 | 6 | ||||||||||||||||||||||
| J Rive T Wilkison | 6 | 3 | 6 | P Aldrich D Visser | 4 | 6 | 7 | ||||||||||||||||||||
 V Amritraj P Lundgren | 7 | 6 | 4 | R Leach L Warder | 6 | 2 | 6 | ||||||||||||||||||||
 O Delaître T Tulasne | 6 | 0 | V Amritraj P Lundgren | 2 | 3 | ||||||||||||||||||||||
| M Flur T Siegel | 1 | 2 | 4 | R Leach L Warder | 6 | 6 | |||||||||||||||||||||
| 4 | R Leach L Warder | 6 | 6 | 6 | P Aldrich D Visser | 7 | 6 | ||||||||||||||||||||
| 7 | J Courier P Sampras | 6 | 4 | 6 | 7 | J Courier P Sampras | 6 | 3 | |||||||||||||||||||
| M Davis T Pawsat | 4 | 6 | 1 | 7 | J Courier P Sampras | 6 | 6 | ||||||||||||||||||||
| N Kroon E Winogradsky | 6 | 6 | N Kroon E Winogradsky | 3 | 3 | ||||||||||||||||||||||
| E Ross J Ross | 4 | 3 | 7 | J Courier P Sampras | 4 | 6 | 6 | ||||||||||||||||||||
| B Pearce B Talbot | 6 | 4 | 6 | 2 | J Grabb P McEnroe | 6 | 4 | 3 | |||||||||||||||||||
| C Honey R Krishnan | 2 | 6 | 1 | B Pearce B Talbot | 1 | 4 | |||||||||||||||||||||
| S Kruger J Stoltenberg | 4 | 1 | 2 | J Grabb P McEnroe | 6 | 6 | |||||||||||||||||||||
| 2 | J Grabb P McEnroe | 6 | 6 | ||||||||||||||||||||||||
The 1990 Cincinnati Open, was a tennis tournament played on outdoor hard courts. It was the 91st edition of the tournament and was part of the 1990 ATP Tour. It took place in Cincinnati, Ohio, United States from August 13 through August 20, 1990. Ken Flach and Robert Seguso were the defending champions, but lost in the second round to Sven Salumaa and Byron Talbot. Darren Cahill and Mark Kratzmann won in the final, 7–6, 6–2, against Neil Broad and Gary Muller.
Brad Gilbert and Vince Van Patten were the defending champions but only Gilbert competed that year with Kevin Curren.
John Fitzgerald and Anders Järryd were the defending champions but only Järryd competed that year with Jakob Hlasek.
Ken Flach and Robert Seguso were the defending champions but lost in the first round to Tim Pawsat and Laurie Warder.
Guy Forget and Yannick Noah were the defending champions but only Forget competed that year with Henri Leconte.
Peter Fleming and John McEnroe were the defending champions but they competed with different partners that year, Fleming with Gary Donnelly and McEnroe with his brother Patrick.
Jorge Lozano and Todd Witsken won in the final 6–3, 7–6 against Pieter Aldrich and Danie Visser.
Jorge Lozano and Todd Witsken were the defending champions but did not compete that year.
Rick Leach and Jim Pugh were the defending champions but lost in the quarterfinals to Grant Connell and Glenn Michibata.
Kelly Evernden and Johan Kriek were the defending champions but did not compete that year.
Kevin Curren and David Pate were the defending champions but lost in the second round to Amos Mansdorf and Mikael Pernfors.
Ken Flach and Robert Seguso were the defending champions but lost in the semifinals to John Fitzgerald and Anders Järryd.
John Fitzgerald and Anders Järryd were the defending champions but lost in the first round to Jonathan Canter and Bruce Derlin.
Rick Leach and Jim Pugh were the defending champions, but lost in the semifinals to Grant Connell and Glenn Michibata.
Pieter Aldrich and Danie Visser won the title, defeating Connell and Michibata 6–4, 4–6, 6–1, 6–4, in the final.
Rick Leach and Jim Pugh were the defending champions, but lost in the third round this year.
The men's doubles tournament at the 1988 US Open was held from August 29 to September 11, 1988, on the outdoor hard courts at the USTA National Tennis Center in New York City, United States. Sergio Casal and Emilio Sánchez won the title, defeating Rick Leach and Jim Pugh by walkover in the final.
Ken Flach and Robert Seguso successfully defended their title, defeating John Fitzgerald and Anders Järryd in the final, 6–4, 2–6, 6–4, 7–6(7–3) to win the gentlemen's doubles title at the 1988 Wimbledon Championships.
The men's doubles tournament at the 1988 French Open was held from 23 May until 5 June 1988 on the outdoor clay courts at the Stade Roland Garros in Paris, France. Andrés Gómez and Emilio Sánchez won the title, defeating John Fitzgerald and Anders Järryd in the final.
The men's doubles tournament at the 1989 US Open was held from August 28 to September 10, 1989, on the outdoor hard courts of the USTA National Tennis Center in New York City, United States. John McEnroe and Mark Woodforde won the title, defeating Ken Flach and Robert Seguso in the final.
The men's doubles tournament at the 1991 US Open was held from August 26 to September 8, 1991, on the outdoor hard courts of the USTA National Tennis Center in New York City, United States. John Fitzgerald and Anders Järryd won the title, defeating Scott Davis and David Pate in the final.