Lydia Ko (Korean: 고보경, Hanja: 高寶璟, born Bo-kyung Ko, 24 April 1997) is a Korean New Zealander female professional golfer who became the No. 1 ranked woman professional golfer on 2 February 2015 at 17 years 9 months 8 days of age, making her the youngest player of either sex to be ranked No. 1 in professional golf. On 13 September 2015, she became the youngest woman, at age 18 years, 4 months and 20 days, to win a major championship when she won The Evian Championship in France. Her closing round of 63 was a record lowest final round in the history of women's golf majors. She had been the top-ranked woman amateur golfer in the world for 130 weeks when she announced she was turning professional on 23 October 2013. She became the youngest person ever to win a professional golf tour event and youngest person ever to win an LPGA Tour event. In August 2013, she became the only amateur to win two LPGA Tour events. As an amateur she never missed a cut in 25 professional tournaments, and by September 2013 had risen to fifth in the Women's World Golf Rankings in only 23 professional tournaments. Ko played her first LPGA Tour event on 9 February 2012 (14 years, 9 months, 16 days) and made the cut in her first 53 LPGA Tour events through 4 June 2015 (18 years, 1 month, 11 days). In April 2014, Ko was named as one of Time magazine's 100 most influential people. The same month she advanced to No 2 woman professional golfer in the world when she won the Swinging Skirts LPGA Classic. On 22 November 2015, Ko won the LPGA Rolex Player of the Year Award by two points over Inbee Park, making her the youngest winner in the 49 years of the award. In both 2014 and 2015, Ko has been named in the EspnW Impact25 list of twenty-five athletes and influencers who have made the greatest impact for women in sports. In 2016, Ko was named Young New Zealander of the Year in the annual New Zealander of the Year Awards.