Question: In the 2013 BWF World Championships – Men's singles the defending champion won the olympics how many times?

Context paragraphs:
India at the 2011 BWF World Championships: The Indian national badminton team participated in the 2011 BWF World Championships held at Wembley Arena in London, England from August 8 to August 14, 2011.  It was the 19th tournament of the BWF World Championships, an annual event considered prestigious in the calendar of badminton.  The tournament is organized by the world governing body of badminton Badminton World Federation (BWF).

Bao Yixin: Bao Yixin (; born 1992) is a Chinese female badminton doubles player.  She won the Women's Doubles category with many different partners.  In 2010, she won two World Junior titles at the 2010 BWF World Junior Championships held in Guadalajara, Mexico.  In the Girls' Doubles event, she was crowned BWF World Junior Champion 2010 with Ou Dongni and in the Mixed Doubles she was crowned BWF World Junior Champion 2010 with Liu Cheng.  She also won the Mixed Doubles at the 2009 Asian Junior Badminton Championships with Lu Kai and the Mixed Doubles at the 2010 Asian Junior Badminton Championships with Liu Cheng.  Partnering with Tang Yuanting, Bao became the Women's Doubles champion at the 2015 All England Super Series Premier.  Bao graduated with a bachelor's degree from Xiangtan University.

2013 BWF World Junior Championships – Teams event: The Team event tournament of the 2013 BWF World Junior Championships was the fifteenth tournament of the BWF World Junior Championships.  It was held from October 23–27, 2013 in Bangkok, Thailand.  According to the Badminton World Federation (BWF) 32 teams have confirmed their participation.  The winner of the tournament would have Suhandinata Cup for about a year until the next BWF World Junior Championships Team Event is held.

Lee Chong Wei career statistics: This is a list of the main career statistics of Malaysian professional badminton player, Lee Chong Wei.  To date, Lee has won sixty three singles titles, including eleven Super Series Premier titles, twenty-eight Super Series titles, and four Super Series Finals titles.  He is the first men's singles player to win at least once in different Super Series Premier titles.  He is also a Silver medalist at the 2008 Summer Olympics, 2012 Summer Olympics and the 2016 Summer Olympics.  He is the runner-up at the 2011 BWF World Championships, 2013 BWF World Championships and 2015 BWF World Championships.  His achievement as the runner-up at the 2014 BWF World Championships was canceled due to doping violations.  Following that matter, he served an 8-month suspension from international competitions.

2013 BWF World Championships – Women's singles: The Women's Singles tournament of the 2013 BWF World Championships was held from August 5–11.  Wang Yihan was the defending champion.  Ratchanok Inthanon defeated Li Xuerui 22–20, 18–21, 21–14 in the final.

Lin Dan: Lin Dan (born October 14, 1983) is a Chinese professional badminton player.  He is a two-time Olympic champion, five-time World champion, as well as a six-time All England champion.

Mathew Fogarty: Mathew Fogarty (born 30 October 1956) is an American male badminton player who has specialized in doubles events.  He has shared the men's double title in four U.S. National Badminton Championships (1980, 1984, 1986, 2000) with three different partners.  In 2008, he won the bronze medal at the Pan Am Badminton Championships in the mixed team event.  He also won the men's doubles bronze medal in 2009 and 2014.  In 2015, at age 58, Fogarty became the oldest shuttler competing at the BWF World Championships at the Istora Senayan Indoor Stadium, Jakarta.  He has been qualified for the BWF World Championships seven times.  He practiced six days a week after work to maintain his fitness.  Fogarty work as a Physician by practice in the US Navy.

2013 BWF World Championships – Men's singles: The Men's Singles tournament of the 2013 BWF World Championships was held from August 5–11.  Lin Dan was the defending champion.

2010 BWF World Championships – Men's Singles: The 2010 BWF World Championships was the 18th tournament of the BWF World Championships.  It was held at Stade Pierre de Coubertin in Paris, France, from August 23 to August 29, 2010.  Following are the results of the men's singles:

2013 BWF Season: The 2013 BWF Season was the overall badminton circuit organized by the Badminton World Federation (BWF) for the 2013 badminton season to publish and promote the sport.  Besides the BWF World Championships, BWF promotes the sport of Badminton through an extensive worldwide programme of events in four structure levels.  They were the individual tournaments called Super Series, Grand Prix Events, International Challenge and International Series.  Besides the individual tournaments, Team Events such as Thomas Cup & Uber Cup and Sudirman Cup are held every other year.

Supporting paragraphs: 2013 BWF World Championships – Men's singles Lin Dan
Answer: two-time