Rory McIlroy just overtook fellow Eurpoean Luke Donald as the number one ranked golfer in the world with his win at the 2012 Honda classic this past weekend.
McIlroy has already surpassed the expectations of many on how good he would be on tour. However, there are many golfers on tour who came on with high expectations, some even being dubbed "the next Tiger Woods," and have never met the expectations that were set for them.
Winning a major championship on the PGA Tour is one of the biggest determinants of success. Many golfers on tour who are considered underachievers have won Major Championships. With as big of a deal as winning majors in golf is, none of the golfers on this list will be winners of major championships.