Question: On what sport are Anna-Lena Grönefeld and Rick Leach professionals?

Context paragraphs:
2009 Generali Ladies Linz – Doubles: Katarina Srebotnik and Ai Sugiyama were the defending champions, but Sugiyama retired from the sport on October 2, 2009, and only Srebotnik competed that year.  Srebotnik partnered with Anna-Lena Grönefeld, and they won in the final 6-1, 6-4 against Klaudia Jans and Alicja Rosolska.

2010 Generali Ladies Linz – Doubles: Anna-Lena Grönefeld and Katarina Srebotnik were the defending champions, but Grönefeld didn't participate that year.

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.

2006 Wismilak International – Doubles: Anna-Lena Grönefeld and Meghann Shaughnessy were the defending champions, but none competed this year.

2007 Bank of the West Classic - Doubles: Anna-Lena Grönefeld and Shahar Pe'er were the defending champions, but Grönefeld chose not to participate.

2007 Bank of the West Classic – Doubles: Anna-Lena Grönefeld and Shahar Pe'er were the defending champions, but Grönefeld chose not to participate.  Pe'er instead played with Sania Mirza.

2009 Challenge Bell – Doubles: Anna-Lena Grönefeld and Vania King were the defending champions, but Grönefeld decided not to participate this year.

2011 Büschl Open – Doubles: Kristina Barrois and Anna-Lena Grönefeld were the defending champions, but Grönefeld decided not to participate.  Barrois partnered up with Yvonne Meusburger, but lost in the final to Kiki Bertens and Anne Keothavong.

2006 Pattaya Women's Open – Doubles: Marion Bartoli and Anna-Lena Grönefeld were the defending champions, but none competed this year as both were in Paris at the same week.

Anna-Lena Grönefeld: Anna-Lena Grönefeld (born 4 June 1985) is a German tennis player.  She turned professional in April 2003.

Supporting paragraphs: Anna-Lena Grönefeld Rick Leach
Answer: tennis