Question: Kastles Stadium at The Wharf had a ribbon-cutting ceremony attended by the current commissioner of what organization?

full_context: Document 1: Martina Navratilova: Martina Navratilova (Czech: "Martina Navrátilová" ] ; born Martina Šubertová ] ; October 18, 1956) is a former Czechoslovak and later American tennis player and coach. In 2005, "Tennis" magazine selected her as the greatest female tennis player for the years 1965 through 2005 and she is considered one of the best, if not the best, female tennis players of all time.
Document 2: Robert F. Kennedy Memorial Stadium: Robert F. Kennedy Memorial Stadium, commonly known as RFK Stadium, is a multi-purpose stadium in Washington, D.C., located about two miles (3 km) due east of the U.S. Capitol building. It is the current home of D.C. United of Major League Soccer and the AT&T Nation's Football Classic. The U.S. men's national soccer team has played 22 matches there from 1977 to 2013, more than any other stadium.
Document 3: 1997 Wimbledon Championships: The 1997 Wimbledon Championships was a tennis tournament played on :grass courts at the All England Lawn Tennis and Croquet Club in Wimbledon in London in England. It was the 111th edition of the Wimbledon Championships and were held from 23 June to 6 July 1997. The championships saw the inauguration of a new No.1 Court, the third court to be named such in the club's history. To commemorate the new stadium, all the three-time or more singles champions were invited to a ceremony marking the opening of the new court and were presented with a silver salver. Ten of the thirteen surviving eligible champions attended: Louise Brough, Rod Laver, Margaret Court, Billie Jean King, John Newcombe, Chris Evert, Martina Navratilova, John McEnroe, Boris Becker and Pete Sampras. The only surviving absentees were Maria Bueno and Björn Borg who declined to attend and Steffi Graf who was recovering from knee surgery and unable to be present.
Document 4: King Mongkut's Institute of Technology Ladkrabang Stadium: King Mongkut's Institute of Technology Ladkrabang Stadium
Document 5: Jennifer Capriati: Jennifer Maria Capriati (born March 29, 1976) is an American former professional tennis player. A member of the International Tennis Hall of Fame, she won three singles championships in Grand Slam tournaments and a gold medal at the 1992 Summer Olympics in Barcelona, reached the World No. 1 ranking, and is considered one of the greatest tennis players of all time.
Document 6: Children's Mercy Park: Children's Mercy Park (formerly Sporting Park and Livestrong Sporting Park) is a soccer-specific stadium in Kansas City, Kansas, United States, and is the home of Sporting Kansas City. The stadium is located near Kansas Speedway and it opened during the 2011 season of Major League Soccer on June 9, 2011 with a match against the Chicago Fire. The stadium has a seating capacity of 18,467 seats, which can expand to 25,000 for concerts. Most SKC games attract around 21,000 because of different stadium modes. The stadium is Sporting Kansas City's third home venue; then known as the Kansas City Wizards, the team played in Arrowhead Stadium from 1996 to 2007 and CommunityAmerica Ballpark from 2008 to 2010. In 2013, the stadium hosted the MLS All-Star Game, the United States men's national soccer team, and the MLS Cup, three of the most prestigious matches in the United States, and is the only stadium to host all three in the same year.
Document 7: Ilana Kloss: Ilana Sheryl Kloss (born 22 March 1956) is a former professional tennis player, tennis coach, and the current commissioner of World TeamTennis, a position that she has held since 2001.
Document 8: Serena Williams: Serena Jameka Williams (born September 26, 1981) is an American professional tennis player. The Women's Tennis Association (WTA) has ranked her world No. 1 in singles on eight occasions, from 2002 to 2017. She became the world No. 1 for the first time on July 8, 2002. On the sixth occasion, she held the ranking for 186 consecutive weeks, tying the record set by Steffi Graf for the most consecutive weeks as world No. 1 by a female tennis player. In total, she has been world No. 1 for 319 weeks, which ranks her third in the Open Era among female tennis players. Some commentators, players and sports writers regard her as the greatest female tennis player of all time.
Document 9: Family Circle Tennis Center: Family Circle Tennis Center is a tennis center on Daniel Island in Charleston, South Carolina. Built in 2001, the center has 17 courts, including the 10,200-seat Volvo Car Stadium (previously named the Family Circle Magazine Stadium). Between 2001 and 2015, it hosted the WTA Tour's Family Circle Cup, which was promoted as the Volvo Cars Open beginning in the 2016 season.
Document 10: 2011 US Open Series: In tennis, the eighth edition of the US Open Series (known as Olympus US Open Series for sponsorships reasons), includes ten hard court tournaments that start on July 18, 2011 in Atlanta and will end in Winston-Salem for the men and in New Haven for the women on August 28, 2011. This edition has scheduled five separate men's tournaments, four women's tournaments, and the Western & Southern Open that will host both a men's and women's event. The series includes two ATP World Tour Masters 1000 and two WTA Premier 5 events to headline the series.
Document 11: Kastles Stadium at The Wharf: The Kastles Stadium at The Wharf was a tennis stadium on the Southwest Waterfront in Washington, D.C. Built in 2011, the stadium was the home venue for the Washington Kastles tennis team. The stadium was opened on June 14, 2011, with a ribbon-cutting ceremony attended by Billie Jean King, Ilana Kloss, District of Columbia mayor Vincent Gray, and others. The Kastles opened their 2011 season on July 5 at the stadium playing against the Kansas City Explorers.
Document 12: Linky Boshoff: Delina Ann Boshoff-Mortlock, commonly known as Linky Boshoff, (born 12 November 1956), is a former professional tennis player who won the 1976 US Open women's doubles title with her partner Ilana Kloss.
Document 13: Billie Jean King: Billie Jean King ("née" Moffitt; born November 22, 1943) is an American former World No. 1 professional tennis player. King won 39 Grand Slam titles: 12 in singles, 16 in women's doubles, and 11 in mixed doubles. King won the singles title at the inaugural WTA Tour Championships. King often represented the United States in the Federation Cup and the Wightman Cup. She was a member of the victorious United States team in seven Federation Cups and nine Wightman Cups. For three years, King was the United States' captain in the Federation Cup.
Document 14: Zina Garrison: Zina Lynna Garrison (born November 16, 1963) is a former professional tennis player from the United States. During her career, she was a women's singles runner-up at Wimbledon in 1990, a three-time Grand Slam mixed doubles champion, and a women's doubles gold medalist and singles bronze medalist at the 1988 Olympic Games. She is currently coaching Taylor Townsend.
Document 15: Sports in Washington, D.C.: Sports in the Washington, D.C. area include major league sports teams, popular college sports teams, and a variety of other team and individual sports. The Washington metro area is also home to several major sports venues including Capital One Arena, RFK Stadium, FedExField, and Nationals Park. Washington teams are widely known as some of the least successful in American sports, as no big four team has reached its sport's conference championship round since the 1998 Stanley Cup playoffs and no team has won a championship since the Redskins won Super Bowl XXVI. The area is also home to two regional sports television networks, Comcast SportsNet Mid-Atlantic, which is based in Bethesda, Maryland and Mid-Atlantic Sports Network.
ground_truth: World TeamTennis