question: Which tennis player is older, Mariaan de Swardt or John Peers? 
answer: Mariaan de Swardt
context: Title: John Peers
  Passage: John William Peers (born 25 July 1988) is an Australian professional tennis player who competed mainly on the ATP Challenger Tour both in singles and doubles until 2013, when he began to focus solely on doubles and began competing on the ATP World Tour.
  Title: 1999 Wimbledon Championships – Women's Doubles
  Passage: 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.
  Title: 1996 Toray Pan Pacific Open – Doubles
  Passage: 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.
  Title: Mariaan de Swardt
  Passage: 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.
  Title: 2000 Australian Open – Mixed Doubles
  Passage: Mariaan de Swardt and David Adams were the defending champions but only Adams competed that year with Kristie Boogert.
  Title: Albé de Swardt
  Passage: Albertus Jacobus de Swardt (born (1990--)10 1990 in George, South Africa) is a former South African rugby union player, whose regular playing position was hooker.  He started his career with Western Province in 2011 and, after a short spell in Italy with L'Aquila in 2012, returned to South Africa to play for the Eastern Province Kings between 2013 and 2015.
  Title: 1998 Boston Cup – Singles
  Passage: Mariaan de Swardt won in the final 3–6, 7–6, 7–5 against Barbara Schett.
  Title: 1997 Welsh International Open – Doubles
  Passage: Katrina Adams and Mariaan de Swardt were the defending champions but did not compete that year.
  Title: 1997 Challenge Bell – Doubles
  Passage: 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.
  Title: 1998 Boston Cup – Doubles
  Passage: Lisa Raymond and Rennae Stubbs won in the final 6–4, 6–4 against Mariaan de Swardt and Mary Joe Fernández.
citations: Mariaan de Swardt John Peers