The (really) Young Guns of Professional Golf

1 of 5 Ian Walton/Getty Images
Born: April 19, 1993 Picking up his second European Tour win at the 2011 Malaysian Open, Manassero has been breaking records for years. He was the youngest player to win the British Amateur and the youngest player to make the cut at the Masters, both at 16 years old. He became the youngest European Tour winner in history when he won the Castello Masters in October 2010, and now holds second place on the list as well with his recent win in Malaysia.
2 of 5 John Biever/SI
Born: May 4, 1989 McIlroy nearly became the first of this group to win a major at this year's Masters. Despite his collapse on Sunday at Augusta, McIlroy has two professional victories already, four top-10 finishes at majors (which does not include the 2011 Masters) and sits at No. 7 in the official world rankings.
3 of 5 Robert Beck/SI
Born: September 17, 1991 Ishikawa is a certified superstar in his native Japan, and is followed by a mob of Japanese media members everywhere he goes. The youngest-ever winner of a professional golf tournament, and the youngest to crack the top 50 in the world rankings, everyone will know Ryo's name soon -- that is if they don't already.
4 of 5 Andrew Redington/Getty Images
Born: December 13, 1988 The lone American on the list, Fowler is a star in his own right. Already one of the most popular and recognizable faces on the PGA Tour, Fowler has yet to win professionally but had seven top 10s that included two runner-up finishes in 2010, his rookie season. The first rookie ever to be selected to the U.S. Ryder Cup team, Fowler birdied the final four holes in his singles match against Edoardo Molinari to earn a half-point for the Americans at Celtic Manor.
5 of 5 Robert Beck/SI
Born: November 12, 1987 Australian Jason Day won just about every junior and amateur tournament offered in his homeland growing up. He turned pro in 2006 and won his first tournament at last year's HP Byron Nelson Championship, becoming the youngest Australian ever to win a PGA Tour event. At the 2011 Masters, Day made a Sunday charge, birdieing his final two holes to finish T2.