Question: Barry Klarberg managed what Russian former professional tennis player?
Context: Albert Burke (1901 – 1958) was an Irish professional tennis player based in France.  Albert Burke was the son of Thomas Burke.  Thomas Burke was a professional tennis player when professional tennis began in the late 19th century and Albert Burke's brother Edmund Burke was also a professional tennis player .  Albert Burke won the Bristol Cup in France (the top professional tournament in the world in the 1920s), in 1924 and 1925 (beating Roman Najuch in both finals) .  He was also losing finalist in the Bristol Cup in 1926, 1929 and 1931 (losing all three finals to Karel Kozeluh) .  Burke finished second in the 1930 French Pro Championship round robin (Karel Kozeluh was first) .  At the US Pro Tennis Championships Burke was a quarter finalist in 1931 (losing to Howard Kinsey) and 1932 (losing to Bill Tilden) .  At the Wembley Championships Burke lost in the quarter finals in 1935 (losing to Ellsworth Vines) . Barry J. Klarberg (born March 4, 1961), CPA, is an American businessman.  He is a professional business and wealth manager for athletes, entertainers and high-net-worth individuals.  He is the founder and CEO of Monarch Business and Wealth Management, a full-service firm and family office that specializes in providing business and wealth management services.  Klarberg has managed several prominent individuals including musician/actor Justin Timberlake, entrepreneur Russell Simmons, DJ and record producer Kaskade, NASCAR champion Kyle Busch, professional tennis player/model Anna Kournikova, NBA All-Star Kyle Lowry, MLB All-Star and Homerun Champion José Bautista, MLS All-Star and Captain of the United States men's national soccer team Michael Bradley, and NHL Hall-of-Famer Mark Messier. Anna Sergeyevna Kournikova (Russian: А́нна Серге́евна Ку́рникова ; ] ; born 7 June 1981) is a Russian former professional tennis player.  Her appearance and celebrity status made her one of the best known tennis stars worldwide.  At the peak of her fame, fans looking for images of Kournikova made her name one of the most common search strings on Google Search. Vasilisa Alekseyevna Bardina (Russian: Василиса Алексеевна Бардина , born 30 November 1987) is a Russian former professional tennis player. Anastasiya Andreyevna Myskina (Russian: Анастасия Андреевна Мыскина ; ] ; born 8 July 1981) is a Russian former tennis player.  She won the 2004 French Open singles title, becoming the first Russian female tennis player to win a Grand Slam singles title.  Subsequent to this victory, she rose to No. 3 in the WTA rankings, becoming the first Russian female tennis player to reach the top 3 in the history of the rankings.  In September 2004, she reached a career-high ranking of No. 2.  She has not officially retired, but has been inactive on the WTA Tour since May 2007. Nikolay Vladimirovich Davydenko (Russian: Никола́й Влади́мирович Давыде́нко ; ] ; born 2 June 1981) is a Russian former professional tennis player.  He achieved a career-high singles ranking of World No. 3 in November 2006.  Davydenko's best result in a Grand Slam tournament was reaching the semi-finals, which he accomplished on four occasions: twice each at the French Open and the U.S. Open, losing to Roger Federer in all but one of them.  His biggest achievement was winning the 2009 ATP World Tour Finals, and he also won three ATP Masters Series.  In mid-October 2014 Davydenko retired from competitions. This is a list of the main career statistics of Russian former professional tennis player Marat Safin. Elena Alekseyevna Makarova (Russian: Елена Алексеевна Макарова , born 1 February 1973) is a Russian former professional tennis player. Kenneth Carlsen (born 17 April 1973) is a Danish former professional tennis player, who was active between 1992 and 2007.  Carlsen played left-handed with a one-handed backhand.  His greatest asset was his powerful serve, and his game was therefore best suited to fast surfaces (grass and hardcourt) .  For most of his long career Carlsen was Denmark's best tennis player, and consistently among the few Danish players playing at the highest international level.  He was awarded as best Danish "Tennis Player of the Year" seven times by the Danish Tennis Federation (first time in 1991, last time in 2005).  Two times the award went to the Danish Davis Cup team, of which Kenneth Carlsen until 2003 was a central part (having a 29–13 record in singles). Murphy Jensen (born October 30, 1968) is an American former professional tennis player from Ludington, Michigan, and currently the coach of the Washington Kastles of World TeamTennis.  His elder brother is former professional tennis player Luke Jensen.  Jensen has a son William (born 1999) with actress Robin Givens, whom he dated periodically during the late 1990s.
Answer: Anna Kournikova