5. Ryo Ishikawa (Japan, Age 20)
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The Japanese phenom gained worldwide headlines in 2007 at the incredibly young age of 15.
That was when he won the Munsingwear Open KSB Cup, as an amateur in his first ever tour appearance, becoming the youngest player to win on the Japan Golf Tour.
He turned professional in 2008 and quickly rose up the world rankings—breaking the record for the youngest player ever to reach the top 50 and 100.
Ishikawa has since racked up 10 professional wins despite only just turning 20, but all have come in his native Japan. He has failed to make much of a splash yet in USA or Europe.
But in 2011, he finally looked like he may be adapting to golf in the United States as he tied for 20th in the Masters and then tied for 30th in the US Open, playing some attractive and bold golf along the way.
Ishikawa currently sits at No. 47 in the world and is poised to take the next step in his career as he gets more experience and consistency in his game.