Question: Which American professional tennis player born in 1980 was a defending champion during the 2010 Wimbledon Championships – Women's Doubles?
Context: Sergiy Eduardovych Stakhovsky (Ukrainian: Сергій Едуардович Стаховський , ] ; born January 6, 1986) is a Ukrainian professional tennis player.  Stakhovsky turned professional in 2003 and had been playing mostly at the Challenger level from 2005–2008.  His career-high singles ranking is World No. 31 (September 2010) and he has reached as high as No. 33 in doubles the same month.  He won his first career title in March 2008, as a lucky loser ranked no. 209, defeating top seed Ivan Ljubičić in the final, thus becoming the first lucky loser to win a title since Christian Miniussi in 1991.  He is the elder brother of tennis player Leonard Stakhovsky.  He is currently coached by Fabrice Santoro.  He is well known for beating seven-time winner and defending champion Roger Federer in the 2nd round of the 2013 Wimbledon Championships ending his record run of 36 consecutive Grand Slam quarterfinals. Jamie Murray is a professional tennis player who is the current British number one doubles player.  He has reached eight grand slam finals in total: (4 Doubles, 4 Mixed), he has won the mixed doubles at the 2007 Wimbledon Championships, 2017 Wimbledon Championships and 2017 US Open, and the men's doubles at the 2016 Australian Open and 2016 US Open, and has finished as runner-up in the men's doubles tournament at the 2015 Wimbledon Championships and 2015 US Open and in mixed doubles at the 2008 US Open.  Murray has been ranked as high as World No. 1 in the ATP doubles rankings, and was the first Britain to be ranked as world number one since the introduction of computerised world rankings in the 1970s.  He is currently ranked at world No. 5. The 1879 Men's tennis season was composed of the third annual pre-open era tour.  It now incorporated 12 tournaments staged in Australia and Great Britain and Ireland.  The 1879 Wimbledon Championships was won by John Hartley defending champion Patrick Francis Hadow, defending champion could not participate in the Challenge Round.  This year saw the innugrial Irish Championships that in its early stages of development was considered as important that of the Wimbledon Championships the event was won by Vere St. Leger Goold who defeated in Charles David Barry in the final by Charles David Barry 8-6, 8-6.  Important this year was the staging now of three hard court tournaments namely the Dublin University LT Championships the East Gloucestershire Championships held in Cheltenham Great Britain.  and the first tournament to be held outside of Europe in Australia with the Victorian Championships. Vera Igorevna Zvonareva (Russian: Ве́ра И́горевна Звонарёва ; ] ; born 7 September 1984) is a Russian professional tennis player.  She was introduced to tennis at the age of six and turned professional in 2000.  Her career high is world No. 2 by the WTA.  Zvonareva has won twelve WTA Tour singles titles and reached the finals of the 2008 WTA Tour Championships, 2010 Wimbledon Championships, and 2010 US Open.  She also was a bronze medalist at the 2008 Beijing Olympics.  In doubles, she has won four Grand Slam titles.  Two of the titles came in women's doubles, the first one at the 2006 US Open, partnering Nathalie Dechy, and the other at the 2012 Australian Open, partnering Svetlana Kuznetsova.  Her other two came in mixed doubles, the first at the 2004 US Open, partnering Bob Bryan, and her second at the 2006 Wimbledon Championships, partnering Andy Ram. Venus Williams and Serena Williams were the defending champions, but lost in the quarterfinals to Elena Vesnina and Vera Zvonareva. Meredith McGrath (born April 28, 1971) is a former professional tennis player.  She was born in Midland, Michigan, USA and made her debut on the Women's Tennis Association tour in 1988.  In her eight-year professional career Meredith achieved career-high world rankings of #18 in singles and #4 in doubles.  She notched victories over such players as Martina Navratilova, Martina Hingis, Anna Kournikova, Jana Novotna, Arantxa Sanchez Vicario, and Gigi Fernandez.  The pinnacle of her career came in reaching the singles semi-finals and doubles finals at the 1996 Wimbledon Championships.  In the singles she defeated Mana Endo, Amanda Coetzer, Nancy Feber, Katarína Studeníková and Mary Joe Fernandez before losing to Arantxa Sánchez Vicario.  An injury the week prior to the 1996 Wimbledon Championships eventually ended her career.  Meredith won the 1995 U.S. Open Mixed Doubles Championship (she was runner-up in 1989) and was the runner-up in the 1994 Australian Open Doubles Championship.  Meredith won three WTA singles titles: Oklahoma City and Eastbourne in 1994 and Birmingham in 1996, 25 doubles titles.  She retired with a 140–83 record in singles and a 189–40 record in doubles.  Meredith was recognized by Tennis Magazine as the WTA Comeback Player of the Year as she overcame near career-ending injuries to having her most successful competitive season in 1996.  In 1994 she received the WTA Tour Comeback Player of the Year. John Robert Isner (born April 26, 1985) is an American professional tennis player who is currently ranked world No. 17 in men's singles by the Association of Tennis Professionals (ATP).  Considered one of the best servers of the ATP World Tour, Isner achieved his career-high singles ranking of world No. 9 in April 2012.  In 2013, he became the 18th player to serve more than 5,000 aces on the ATP World Tour.  He currently has 4th-most aces in the history of ATP, having served more than 8,800 aces.  At the 2010 Wimbledon Championships, he played the longest professional tennis match in history, defeating Nicolas Mahut in a total of 11 hours and 5 minutes of play over the course of three days.  He also played the then 10th-longest singles match, a 5-hour 41-minute encounter in the second round of the 2012 French Open. Lucie Šafářová (] ; born 4 February 1987) is a Czech professional tennis player from Brno.  She is currently the WTA world No. 1 doubles player.  Šafářová has won seven WTA tour singles titles, fifteen doubles titles and reached the quarterfinals of the 2007 Australian Open by upsetting defending champion Amélie Mauresmo in the fourth round.  She reached her first Grand Slam semifinal at the 2014 Wimbledon Championships and her first Grand Slam final at the 2015 French Open.  She also won the 2015 Australian Open, 2015 French Open, 2016 US Open, 2017 Australian Open and 2017 French Open women's doubles titles partnering with Bethanie Mattek-Sands. Venus Ebony Starr Williams (born June 17, 1980) is an American professional tennis player who is currently ranked world No. 5 in the WTA singles rankings.  She is generally regarded as one of the all-time greats of women's tennis and, along with younger sister Serena Williams, is credited with ushering in a new era of power and athleticism on the women's professional tennis tour. This is a list of the main career statistics of Czech professional tennis player Petra Kvitová.  To date, Kvitová has won 20 singles titles including two Grand Slam singles titles at the Wimbledon Championships, one WTA Tour Championships singles title, two WTA Premier Mandatory singles titles and four WTA Premier 5 singles titles.  She was also the bronze medallist at the 2016 Rio Olympics, a semifinalist at the 2010 Wimbledon Championships, 2012 Australian Open and 2012 French Open and a quarterfinalist at the 2011 Australian Open, 2012 Wimbledon Championships, 2013 Wimbledon Championships, 2015 US Open and 2017 US Open.  Kvitová reached her career-high ranking of world no. 2 on 31 October 2011.
Answer: Venus Williams