Question: Svetlana Kuznetsova and Marin Čilić both play which sport?
Context: Serena Williams was the defending champion, but lost to Sabine Lisicki in the fourth round, which ended her 34-match winning streak dating back to the Miami Open.  This was the fourth time in a row that Lisicki defeated the reigning French Open champion at Wimbledon; Svetlana Kuznetsova in 2009, Li Na in 2011, Maria Sharapova in 2012, and Williams in 2013 (Lisicki did not play in 2010). Svetlana Kuznetsova was the defending champion and successfully defended her title, defeating Daria Gavrilova in the final, 6–2, 6–1.  By claiming the title, Kuznetsova became the final qualifier for the 2016 WTA Finals. Svetlana Kuznetsova and Amélie Mauresmo were the defending champions, but Mauresmo retired from the sport on December 3, 2009. This is a list of the main career statistics of Croatian professional tennis player, Marin Čilić.  To date, Čilić has won 16 ATP singles titles including one grand slam singles title at the 2014 US Open, one ATP Masters 1000 title at the 2016 Western & Southern Open and a record four titles at the PBZ Zagreb Indoors.  Other highlights of Čilić's career thus far include a semi-final appearance at the 2010 Australian Open and three consecutive quarterfinals at the Wimbledon Championships from 2014 to 2016.  Čilić achieved a career high singles ranking of World No. 6 on November 21st, 2016. 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. Russian pair Svetlana Kuznetsova and Vera Zvonareva were the defending champions, but Zvonareva decided not to participate due to injury.  Kuznetsova partnered up with Yanina Wickmayer but they lost in the second round to Nuria Llagostera Vives and Zheng Jie. The 2010 Billie Jean King Cup was the 2nd edition of this tennis exhibition tournament.  Seven-time Grand Slam champion Venus Williams, 2009 French Open Champion Svetlana Kuznetsova, and 2009 US Open Champion Kim Clijsters participated.  2009 Australian Open and Wimbledon Champion Serena Williams had to withdraw from the event due to a leg injury.  She was replaced by 2008 French Open Champion Ana Ivanovic.  In the first semifinal, Clijsters defeated Ivanovic in a tiebreaker (7–2), despite Ivanovic having match point at 5–4 up.  Williams defeated Kuznetsova in the second semifinal, 6–4.  Williams defeated Clijsters in the championship match by a score of 6–4 3–6 7–5. Svetlana Aleksandrovna Kuznetsova (Russian: Светла́на Алекса́ндровна Кузнецо́ва ; ] ; born 27 June 1985) is a Russian tennis player.  Kuznetsova has appeared in four Grand Slam singles finals, winning two, and has also appeared in seven doubles finals, winning twice.  As a doubles player, Kuznetsova has reached the finals of each Grand Slam at least once, winning the Australian Open twice.  She is currently the No. 8 ranked player on the WTA rankings. Svetlana Kuznetsova and Elena Likhovtseva were the defending champions, but Kuznetsova did not compete this year.  Likhovtseva teamed up with Magdalena Maleeva and successfully defended her title, by defeating Maria Elena Camerin and Silvia Farina Elia 6–3, 5–7, 6–1 in the final. 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.
Answer: tennis