Updated: 04/06/2009 - Paul Casey finally considers himself one of the world's top golfers, just in time for the Masters. Casey won the Shell Houston Open on Sunday for his first PGA Tour victory, beating J.B. Holmes with a bogey on the first playoff hole. The 31-year-old Englishman has nine international victories since 2001, but had never won in the United States. The victory boosted Casey from No. 12 to No. 6 in the world rankings, a career high.