Question: which sport is played by both Tracy Austin and Sébastien Lareau?

Context paragraphs:
Sébastien Lareau: Sébastien Lareau (born April 27, 1973 in Montreal, Quebec) is a retired professional tennis player.  He became the first Canadian to win a Grand Slam title by winning the 1999 U.S. Open Men's Doubles with his American partner Alex O'Brien.

2001 Canada Masters – Doubles: The 2001 Canada Masters – Doubles was the men's doubles event of the one hundred and twelfth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada.  Sébastien Lareau and Daniel Nestor were the defending champions but they competed with different partners that year, Lareau with Justin Gimelstob and Nestor with Sandon Stolle.  Gimelstob and Lareau lost in the first round to Mark Knowles and Brian MacPhie, as did Nestor and Stolle to Jan-Michael Gambill and Simon Larose.  Jiří Novák and David Rikl won in the final 6–4, 3–6, 6–3 against Donald Johnson and Jared Palmer.

Tracy Austin: Tracy Ann Austin Holt (born December 12, 1962) is an American former World No. 1 retired professional tennis player.  She won three Grand Slam titles, including the women's singles titles at the 1979 and 1981 US Opens, and the mixed doubles title at the Wimbledon Championships in 1980.  Additionally, she won the WTA Tour Championships in 1980 and the year-ending Toyota Championships in 1981, both in singles.  A series of injuries and a serious automobile accident cut short her career.  Since 1979, she has been the youngest US Open female singles champion in history, and she is the youngest inductee of all time at the International Tennis Hall of Fame.  Austin won singles titles on all playing surfaces: clay (both red clay and green clay), indoor carpet, grass, and hard courts.

2000 Paris Masters – Doubles: Sébastien Lareau and Alex O'Brien were the defending champions.  Lareau did not participate this year.  O'Brien partnered Jared Palmer, losing in the semifinals.

2000 Adidas International – Men's Doubles: Sébastien Lareau and Daniel Nestor were the defending champions, but Nestor did not compete this year.  Lareau teamed up with Michael Hill and lost in first round to David Adams and John-Laffnie de Jager.

2000 Legg Mason Tennis Classic – Doubles: Justin Gimelstob and Sébastien Lareau were the defending champions, but none competed this year.

1996 Salem Open Beijing – Doubles: Tommy Ho and Sébastien Lareau were the defending champions but only Lareau competed that year with Brian MacPhie.

2000 Stella Artois Championships – Doubles: Sébastien Lareau and Alex O'Brien were the defending champions but they competed with different partners that year, Lareau with Daniel Nestor and O'Brien with Jared Palmer.

1999 Legg Mason Tennis Classic – Doubles: Grant Stafford and Kevin Ullyett were the defending champions.  Stafford chose not to participate this year.  Ullyett partnered with Piet Norval but lost in the semifinals to the eventual champions Justin Gimelstob and Sébastien Lareau.  <BR>Justin Gimelstob and Sébastien Lareau won in the final over David Adams and John-Laffnie de Jager, 7–5, 7–6.

1998 Advanta Championships – Doubles: Sébastien Lareau and Alex O'Brien were the defending champions, but O'Brien did not participate this year.  Lareau partnered Jeff Tarango, losing in the first round.

Supporting paragraphs: Sébastien Lareau Tracy Austin
Answer: Tennis