Ko, 15, won the Canadian Women's Open to become the youngest winner ever on the LPGA Tour.
2 of 14Lucas Dawson/Getty Images
Ko is also the youngest player (male or female) to win a professional golf tournament; she won the 2012 New South Wales Open at 14.
3 of 14Paul Crock/AFP/Getty Images
Eighteen-year-old Korda prevailed in a six-player playoff to win the 2012 Women's Australian Open.
4 of 14Darren Carroll/Getty Images
Before Ko's recording-breaking wins, Lexi Thompson was the poster girl for teenage Tour winners. In 2011, at 16, Thompson won the 2011 Navistar LPGA Classic to become the youngest LPGA winner and then won again at the 2011 Dubai Ladies Masters to become the youngest Ladies European Tour winner.
5 of 14David Cannon/Getty Images
Tseng's career got off to a quick start with three pro wins as an 18-year-old. She followed that start with her first LPGA (and major) victory at the 2008 LPGA Championship when she was 19. By 22, Yani had become the youngest player to win five majors.
6 of 14David Cannon/Getty Images
Before winning the 2011 U.S. Open as a 22-year-old, McIlroy triumphed at the 2009 Dubai Desert Classic on the European Tour at 19.
7 of 14Andrew Redington/Allsport
Sergio won twice at age 19 -- first at the 1999 Murphy's Irish Open (pictured) and then at the 1999 Linde German Masters.
8 of 14Stuart Franklin/Getty Images
The Italian phenom also won twice as a teen, first at the 2010 Castelló Masters Costa Azahar and later at the 2011 Maybank Malaysian Open. At 17, Manassero's wins earned him the first- and second-place spots on the list of youngest European Tour winners of all time.
9 of 14Kyodo News/AP
The Bashful Prince (as he's known in his native Japan) won the 2007 Munsingwear Open KSB Cup on the Japan Tour when he was just 15. He went on to win a total of nine Japanese Tour events before turning 20.
10 of 14David Cannon/Getty Images
Pressel won the 2007 Kraft Nabisco Championship, becoming the youngest winner of a modern LPGA major at 18 years, 313 days.
11 of 14Bernie Nunez/Getty Images
In her first year on the LPGA Tour, the 18-year-old Creamer won the 2005 Sybase Classic and the 2005 Evian Masters.
12 of 14David Cannon/Getty Images
Eighteen-year-old Danny Lee was victorious at the 2009 Johnnie Walker Classic on the European Tour.
13 of 14Heather Faulkner/AFP/Getty Images
Amy Yang won the 2006 ANZ Ladies Masters on the Ladies European Tour when she was 16.
14 of 14Bob Thomas/Getty Images
The great Seve Ballesteros won the 1976 Dutch Open at 19. That same year, he nearly became the first and only teenager in the modern era to win a men's major when he tied for second at the British Open (pictured).
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