Question: What sport did Robert Lindstedt and Alex O'Brien play?

full_context: Document 1: Jim Courier: James Spencer Courier Jr. (born August 17, 1970) is an American former World No. 1 professional tennis player. During his career, he won four Grand Slam singles titles, two at the French Open and two at the Australian Open. He holds the record for being the youngest man to have reached the finals of all four Grand Slam singles tournaments, at the age of 22 years and 11 months. He also won five Masters 1000 series titles. Until Novak Djokovic in 2016, Courier was the last man to win both the Australian and French Opens in the same calendar year.
Document 2: Alex O'Brien: Alex O'Brien (born March 7, 1970 in Amarillo, Texas) is a retired professional tennis player from the United States, who competed on the ATP Tour. He became the world No. 1 doubles player in May 2000 and was ranked as high as world No. 30 in singles in June 1997.
Document 3: 2013 Topshelf Open – Men's Doubles: Robert Lindstedt and Horia Tecău were the defending champions but Lindstedt decided not to participate.<br>
Document 4: Bent-Ove Pedersen: Bent-Ove Pedersen (born 11 July 1967 in Oslo) is a former tennis player from Norway, who turned professional in 1992. He spent several years playing tennis at Berkeley in California. The right-hander represented his native country in the doubles competition at the 1992 Summer Olympics in Barcelona, where he partnered Christian Ruud. The pair was defeated in the first round by South Africa's eventual runners-up Wayne Ferreira and Piet Norval. Pedersen reached his highest singles ATP-ranking on 13 September 1993, when he became the number 366 of the world. He was in quarterfinal in US Open doubles, 1991, partnering Matt Lucena from the US. He became the number 78 on the doubles ranking 30. August 1993.
Document 5: Stefan Edberg: Stefan Bengt Edberg (] ; born 19 January 1966) is a Swedish former world no. 1 professional tennis player (in both singles and doubles). A major proponent of the serve-and-volley style of tennis, he won six Grand Slam singles titles and three Grand Slam men's doubles titles between 1985 and 1996. He also won the Masters Grand Prix and was a part of the Swedish Davis Cup-winning-team four times. In addition he won four Masters Series titles, four Championship Series titles and the unofficial Olympic tournament 1984, was ranked in the singles top 10 for ten successive years, 9 years in the top 5, and is considered one of the greatest players of his era. Edberg began coaching Roger Federer in January 2014, with this partnership ending in December 2015.
Document 6: 2010 Pilot Pen Tennis – Men's Doubles: Julian Knowle and Jürgen Melzer were the defending champions, but Melzer chose not to participate this year.As a result, Knowle partnered with Andy Ram, but they lost to Robert Lindstedt and Horia Tecău in the semifinals. Lindstedt and Tecău went on to win the tournament, after defeating Rohan Bopanna and Aisam-ul-Haq Qureshi in the final 6–4, 7–5.
Document 7: Andre Agassi: Andre Kirk Agassi ( ; born April 29, 1970) is an American retired professional tennis player and former World No. 1 who was one of the sport's most dominant players from the early 1990s to the mid-2000s. Generally considered by critics and fellow players to be one of the greatest tennis players of all time, Agassi has been called the greatest service returner in the history of the game. Described by the BBC upon his retirement as "perhaps the biggest worldwide star in the sport's history", Agassi compiled performances that, along with his unorthodox apparel and attitude, saw him cited as one of the most charismatic players in history. As a result, he is credited for helping to revive the popularity of tennis during the 1990s.
Document 8: Rick Leach: Rick Leach (born December 28, 1964) is a former professional tennis player and a coach from the United States. A doubles specialist, he won five Grand Slam men's doubles titles (three Australian Open, one Wimbledon, one US Open), and four Grand Slam mixed doubles titles (two Australian Open, one Wimbledon, one US Open). Leach reached the World No. 1 doubles ranking in 1990.
Document 9: 2014 ABN AMRO World Tennis Tournament – Doubles: Robert Lindstedt and Nenad Zimonjić were the defending champions but decided not to participate together. Lindstedt played alongside Łukasz Kubot, but lost in the first round to Julien Benneteau and Édouard Roger-Vasselin. Zimonjić teamed up with Daniel Nestor, but lost in the quarterfinals to Michaël Llodra and Nicolas Mahut.
Document 10: Bob Bryan: Robert Charles Bryan (born April 29, 1978) is an American male professional tennis player. He has won twenty-three Grand Slam titles: 16 in men's doubles and 7 in mixed doubles. He turned professional in 1998. With his twin brother Mike, he has been world No. 1 doubles player for much of the last several years, first achieving the top ranking in September 2003. The brothers were named ATP Team of the Decade for 2000–2009. The brothers became the second men's doubles team to complete the career golden slam at the 2012 Summer Olympics.
Document 11: Horia Tecău: Horia Tecău (] ; born January 19, 1985) is a Romanian tennis player currently ranked World No. 9 in doubles. He turned pro in 2003 and reached the men's doubles finals of the 2010, 2011 and 2012 Wimbledon Championships with Robert Lindstedt before winning it in 2015 with Jean-Julien Rojer, with whom he also won the 2017 US Open. Tecău also won the 2012 Australian Open mixed doubles title with Bethanie Mattek-Sands and the 2015 ATP World Tour Finals with Rojer.
Document 12: 2001 Indian Wells Masters – Men's Doubles: Alex O'Brien and Jared Palmer were the defending champions but they competed with different partners that year, O'Brien with Sébastien Lareau and Palmer with Byron Black.
Document 13: 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.
Document 14: 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.
Document 15: 2015 Australian Open – Men's Doubles: Łukasz Kubot and Robert Lindstedt were the defending champions, but chose not to participate together. Kubot teamed up with Jérémy Chardy, but lost in the second round to Alex Bolt and Andrew Whittington. Lindstedt played alongside Marcin Matkowski, but lost in the second round to Jonathan Erlich and Treat Huey.
ground_truth: tennis