Question: Which tennis player is from the United States, Robert Seguso or Łukasz Kubot?

Context paragraphs:
Robert Lindstedt: Robert Lindstedt (born 19 March 1977) is a Swedish professional tennis player, who turned pro in 1998, and is a doubles specialist.  His biggest title has been the 2014 Australian Open with partner Łukasz Kubot.  He is also a three-time Wimbledon finalist with former partner Horia Tecău.

Gábor Köves: Gábor Köves (born 7 January 1970 in Budapest) is a retired Hungarian Olympian tennis player.  Seoul gold medalists Ken Flach and Robert Seguso stopped him and partner László Markovits in the second round in the 1988 Summer Olympics.

Łukasz Kubot: Łukasz Kubot (; born May 16, 1982) is a Polish professional tennis player.  Kubot is a doubles specialist and won the 2014 Australian Open men's doubles title with Robert Lindstedt as well as the 2017 Wimbledon men's doubles title with Marcelo Melo.  He has also had success in singles, achieving a career-high singles ranking of World No. 41 in April 2010 and reaching the quarterfinals of the 2013 Wimbledon Championships.  In 2013 he was awarded the Gold Cross of Merit by Polish President Bronisław Komorowski.

Donald Wailan-Walalangi: 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.

Milan Šrejber: 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.

1985 US Open – Men's Doubles: 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.

1990 Thriftway ATP Championships – Doubles: The 1990 Cincinnati Open, (also known as the "Thriftway ATP Championships" for sponsorship reasons) 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.

Ken Flach: 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.

Nduka Odizor: Nduka Odizor (born 9 August 1958) is a former tennis player from Nigeria, who represented his native country at the 1988 Summer Olympics in Seoul, where he was defeated in the first round by American lucky loser Robert Seguso.  The right-hander won one career title in singles (Taipei, 1983) and seven doubles titles.  He reached his highest ATP singles ranking of World No. 52 in June 1984.

Robert Seguso: 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.

Supporting paragraphs: Robert Seguso Łukasz Kubot
Answer: Robert Arthur Seguso