Johnson is Masters champion

America's Zach Johnson is the 2007 Masters champion.

The 31-year-old held off the world's best players in one of the most dramatic final rounds seen at Augusta.

He held off Tiger Woods and South Africans Retief Goosen and Rory Sabbatini with a last round of 69 to finish one-over-par.

Padraig Harrington ended four shots behind, on five-over, after a final round of 73.