Dustin Johnson is once again the top-ranked golfer in the world. Johnson earned the distinction with a win at the St. Jude Classic in Memphis that concluded with a four-under 66 on Sunday. It's his 18th tour victory and second of the season. Johnson ended the tournament shooting 19-under. The top five rounded out with Andrew Putnam in second at minus-13, J.B. Holmes at nine-under and Stewart Cink and Richy Werenski tied four fourth at eight-under.