Lydia Ko, New Zealand golfer

Dame Lydia Ko is a New Zealand professional golfer, member of the LPGA Hall of Fame, and the reigning Olympic champion. She first reached number one in the Women's World Golf Rankings on 2 February 2015 at 17 years, 9 months and 9 days of age, making her the youngest player of either gender to be ranked No. 1 in professional golf.