The 2004 Open Championship was a men's major golf championship and the 133rd Open Championship, held from 15 to 18 July at the Old Course of Royal Troon Golf Club in Troon, Scotland. Todd Hamilton won his only major championship, defeating 2002 champion Ernie Els by a stroke in a four-hole playoff. Phil Mickelson finished third, followed by Lee Westwood in fourth. Hamilton was the sixth consecutive American to win at Royal Troon.