Question: What sport do both Jim Grabb and Michael Chang play?

full_context: Document 1: 1997 Grand Prix de Tennis de Lyon – Doubles: Jim Grabb and Richey Reneberg were the defending champions, but did not participate together this year. Grabb partnered Wayne Black, losing in the first round. Reneberg partnered Sjeng Schalken, losing in the first round.
Document 2: 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 3: Kei Nishikori career statistics: This is a list of the main career statistics of Japanese professional tennis player, Kei Nishikori. To date, Nishikori has won 11 ATP singles titles including a record four consecutive titles at the Memphis Open. Other highlights of Nishikori's career thus far include reaching the finals of the 2014 Mutua Madrid Open, 2016 Miami Open, 2016 Rogers Cup, and 2014 US Open, a semi-final appearance at the 2014 ATP World Tour Finals and 2016 US Open, quarterfinal finishes at the 2012 Australian Open, 2015 Australian Open, 2016 Australian Open and 2015 French Open. Nishikori achieved a career high singles ranking of world No. 4 on March 2, 2015.
Document 4: Marin Čilić: Marin Čilić (; born 28 September 1988) is a Croatian professional tennis player. Over the course of his career, Čilić has won 17 ATP singles titles, including the 2014 US Open. His career-high singles ranking is world No. 5, achieved in September 2017. Čilić first came to international prominence by defeating then-World No. 2 Andy Murray in the fourth round of the 2009 US Open. He followed this by reaching the semifinals of the 2010 Australian Open. Among other achievements, Čilić was runner-up at the 2017 Wimbledon Championships, and was a semifinalist at the 2015 US Open as defending champion. Čilić is currently the youngest active male player to have won a slam. Čilić has reached at least the quarterfinal in all four grand slam tournaments. He has a very powerful serve and very powerful groundstrokes.
Document 5: Goran Ivanišević: Goran Ivanišević (; born 13 September 1971) is a retired Croatian professional tennis player and current tennis coach. He is the only person to win the men's singles title at Wimbledon as a wildcard. He achieved this in 2001, having previously been runner-up at the championships in 1992, 1994 and 1998. Before the 2001 tournament, he was ranked 125th and after his victory he was 16th. His career-high singles ranking was World No. 2 (behind Pete Sampras) in 1994. He coached Marin Čilić from September 2013 to July 2016, leading Čilić to his biggest achievement to date, the 2014 US Open title.
Document 6: Jim Pugh: Jim Pugh (born February 5, 1964 in Burbank, California) is a former professional tennis player from the United States. A doubles specialist, he won three Grand Slam men's doubles titles (two Australian Open, one Wimbledon) and five Grand Slam mixed doubles titles (three Australian Open, one Wimbledon, one US Open). Pugh reached the World No. 1 doubles ranking in 1989.
Document 7: Michaël Llodra: Michaël Llodra (] ; born 18 May 1980) is a French former professional tennis player. He is a successful doubles player with three Grand Slam championships and an Olympic silver medal, and has also had success in singles, winning five career titles and gaining victories over Novak Djokovic, Juan Martín del Potro, Tomáš Berdych, Robin Söderling, Jo-Wilfried Tsonga, Nikolay Davydenko, Janko Tipsarević and John Isner. Llodra has been called "the best volleyer on tour".
Document 8: 1994 Comcast U.S. Indoor – Doubles: Jim Grabb and Richey Reneberg were the defending champions, but Reneberg did not participate this year. Grabb partnered Jared Palmer, finishing runner-up.
Document 9: Michael Chang: Michael Te-Pei Chang (born February 22, 1972) is a retired American professional tennis player. He won 34 top-level professional singles titles, including the 1989 French Open when he was 17. He also was a three-time runner-up at the majors and reached a career best ranking of world No. 2 in 1996. Since he was shorter than virtually all of his opponents, he played a dogged defensive style utilizing his quickness and speed. In 2008, he was inducted into the International Tennis Hall of Fame, and he has coached Kei Nishikori since 2014.
Document 10: 1996 Comcast U.S. Indoor – Doubles: Jim Grabb and Jonathan Stark were the defending champions but only Grabb competed that year with Richey Reneberg.
Document 11: 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 12: Jim Grabb: Jim Grabb (born April 14, 1964) is an American former professional tennis player. He was ranked the World No. 1 doubles player in 1989 and in 1993. Grabb's best singles ranking was World No. 24, a ranking he achieved in February 1990.
Document 13: Rick Macci: Rick Macci (born December 7, 1954) is a United States Professional Tennis Association (USPTA) Master Professional, and seven-time USPTA national coach of the year who has trained five number one ranked players—Andy Roddick, Jennifer Capriati, Maria Sharapova, Serena Williams, and Venus Williams.
Document 14: 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 15: 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.
ground_truth: tennis