Lydia Ko became world No. 1 when she was only 17 -- four years younger than Tiger Woods when he claimed the top spot for the first time.
Ko is flanked by an honor guard of Royal Canadian Mounties after her record-breaking win at the 2012 CN Canadian Open. At just 15 years and four months, the New Zealander became the youngest winner of an LPGA Tour event.
Ko returned to Canada in 2013 to repeat her groundbreaking success aged 16 -- this time becoming the youngest to win two LPGA tournaments.
Even before she had become a teenager, Ko was a force in amateur tournaments in New Zealand, here taking part in an event in 2009 aged 11.
In 2012, she became the youngest person ever to win a professional golf event, taking the New South Wales Women's Open aged 14.
Before turning professional in October 2013, Ko (pictured here alongside Stacy Lewis at the British Open) was the top-ranked women's amateur for 130 consecutive weeks.
Ko won her third LPGA Tour title, the 2014 Swinging Skirts Classic, at Lake Merced Golf Club in California -- a course she'd go on to know very well.
In 2014, on her 17th birthday, the New Zealander was one of just five sportspeople to be named in Time Magazine's list of the 100 most influential people in the world. The only other athletes were FIFA World Player of the Year Cristiano Ronaldo, Super Bowl champion Richard Sherman, gay NBA icon Jason Collins and tennis legend Serena Williams.
Guy Wilson, a professional at a local course in Auckland, coached Ko from her first introduction to golf at the age of five until their association ended in December 2013. "She was amazing around the green, hit shots pretty much where she wanted every single time," Wilson told CNN.
Between her victory in the season-ending 2014 CME Group Tour Championship and the 2015 ANA Inspiration, Ko shot 29 consecutive rounds under par, equaling the record m