Mariaan de Swardt and David Adams were the defending champions but only Adams competed that year with Kristie Boogert.
Mariaan de Swardt (born 18 March 1971) is a former tennis player from South Africa, who played as a professional from 1988 to 2001.
 She twice represented her native country at the Summer Olympics, in 1992 and 1996, and was a member of the South African Fed Cup Team in 1992 and 1994–1997.
 In 2006, de Swardt became a U.S. citizen.
The Djokovic–Nadal rivalry is between tennis players Novak Djokovic and Rafael Nadal, who are engaged in a modern-day tennis rivalry.
 The rivalry is the most prolific of the Open Era.
 The two have faced each other 50 times with Djokovic leading 26–24.
 Between 2006–2010, this rivalry was often overshadowed by the historic Federer–Nadal rivalry, but it started to become widely recognized after they played their first Grand Slam final against each other at the 2010 US Open.
 The first half of the rivalry was dominated by Nadal (who led 16–7 after the 2010 season) while the second half has been dominated by Djokovic, winning 11 out the last 13 matches.
 It is widely considered to be one of the greatest rivalries in tennis history.
 It was the first rivalry to involve meetings at all 4 Grand Slam finals (including four consecutive Grand Slam finals) and a record 26 Masters Series matches.
 Their 2012 Australian Open final is considered to be one of the greatest matches of all time, and Mary Carillo and John McEnroe both commented that that Australian Open match and the 2013 French Open semi-final match were the two best matches played on hard and clay courts respectively.
 The Djokovic–Nadal rivalry was listed as the third greatest rivalry in the last decade in 2009 by "ATPworldtour.com" despite its only starting in 2006.
Debbie Graham and Brenda Schultz-McCarthy were the defending champions, but decided not to compete together.
 Graham partnered with Mariaan de Swardt, but lost in the semifinals to Alexandra Fusai and Nathalie Tauziat.
 Schultz-McCarthy partnered with Rebecca Jensen, but lost in the first round to Patricia Hy-Boulais and Chanda Rubin.
The 1999 Wimbledon Championships – Women's Doubles was the women's doubles event of the hundred-and-thirteenth edition of Wimbledon, the third Grand Slam of the year, the most prestigious tournament on grass courts, and the oldest tennis tournament in the world.
 Martina Hingis and Jana Novotná were the defending champions but only Novotná competed that year with Natasha Zvereva.
 Novotná and Zvereva lost in the semifinals to Mariaan de Swardt and Elena Tatarkova.
Mary Carillo (born March 15, 1957) is an American sportscaster and former professional tennis player.
 She is a reporter for NBC Sports and NBC Olympics.
Mariaan de Swardt won in the final 3–6, 7–6, 7–5 against Barbara Schett.
Gigi Fernández and Natasha Zvereva were the defending champions and won in the final 7–6, 6–3 against Mariaan de Swardt and Irina Spîrlea.
Katrina Adams and Mariaan de Swardt were the defending champions but did not compete that year.
Lisa Raymond and Rennae Stubbs won in the final 6–4, 6–4 against Mariaan de Swardt and Mary Joe Fernández.

Question: Are Mary Carillo and Mariaan de Swardt both tennis players?
Answer: yes