Question: Which country held the Olympics games where Robert Seguso won a gold medal with Ken Flach in the men's doubles?

Context articles: Donald Wailan-Walalangi
Seoul
1989 US Open – Men's Doubles
Milan Šrejber
1988 Wimbledon Championships – Men's Doubles
Ken Flach
Robert Seguso
1986 Tokyo Indoor – Doubles
1987 US Open – Men's Doubles
1985 US Open – Men's Doubles

Donald Wailan-Walalangi (born April 14, 1960) is a retired tennis player from Indonesia, who represented his native country at the 1988 Summer Olympics in Seoul, South Korea.
 There he lost in the first round of the men's doubles competition to USA's eventual gold medalists Ken Flach and Robert Seguso, while partnering Suharyadi Suharyadi.
Seoul ( ; 서울; ] ), officially the Seoul Special Metropolitan City – is the capital and largest metropolis of the Republic of Korea (commonly known as South Korea).
 Seoul is the world's 16th largest city, and forms the heart of the Seoul Capital Area, which includes the surrounding Incheon metropolis and Gyeonggi province.
 The Seoul Capital Area houses about half of the country's population of 51.44 million people with 678,102 international residents.
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.
Milan Šrejber (] ) (born 30 December 1963) is a former tennis player from Czechoslovakia, who represented his native country at the 1988 Summer Olympics in Seoul.
 There he reached the semi finals of the men's doubles competition, partnering Miloslav Mečíř.
 The pair was defeated by America's eventual winners Ken Flach and Robert Seguso, but still won the bronze medal.
 The right-hander won one career singles title (Rye Brook, 1988), and reached his highest ATP singles ranking of World No. 23 in October 1986.
The Men's Doubles tournament at the 1988 Wimbledon Championships was held from 20 June to 4 July 1988 on the outdoor grass courts at the All England Lawn Tennis Club in the Wimbledon district in London, England.
 Ken Flach and Robert Seguso successfully defended their title, defeating John Fitzgerald and Anders Järryd in the final.
Kenneth Eliot Flach (born May 24, 1963) is a former professional tennis player from the United States.
 A doubles specialist, he won 4 Grand Slam men's doubles titles (2 Wimbledon and 2 US Open), and 2 Grand Slam mixed doubles titles (1 Wimbledon and 1 French Open).
 He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Robert Seguso.
 Flach reached the World No. 1 doubles ranking in 1985.
Robert Arthur Seguso (born May 1, 1963) is a former professional tennis player from the United States.
 A doubles specialist, he won four Grand Slam men's doubles titles (two Wimbledon, one French Open and one US Open).
 He also won the men's doubles Gold Medal at the 1988 Olympic Games in Seoul, partnering Ken Flach.
 Seguso reached the World No. 1 doubles ranking in 1985.
 He won a total of 29 career doubles titles between 1984 and 1991.
Ken Flach and Robert Seguso were the defending champions, but Seguso did not participate this year.
 Flach partnered Paul Annacone, losing in the first round.
The Men's Doubles tournament at the 1987 US Open was held from September 1 to September 14, 1987, on the outdoor hard courts at the USTA National Tennis Center in New York City, United States.
 Stefan Edberg and Anders Järryd won the title, defeating Ken Flach and Robert Seguso in the final.
The Men's Doubles tournament at the US Open was held from August 27 to September 8, 1985, on the outdoor hard courts at the USTA National Tennis Center in New York City, United States.
 Ken Flach and Robert Seguso won the title, defeating Henri Leconte and Yannick Noah in the final.