The 2003 Open Championship was Curtis' first appearance in a major; he became the first golfer since Francis Ouimet in the 1913 U.S. Open to win his major-championship debut.
On the last day of the British Open Championship of 2003 he was most certainly benefiting from the fact that he could close his 1-under-par score without the added pressure of knowing it was for the win. Thomas Björn was three shots ahead of Curtis when Curtis hit his final putt, but ended up dropping back four shots on the closing holes.
As an amateur, Curtis found much success, winning the Ohio Amateur Championship in 1999 and 2000 (joining professional golfers John Cook and Arnold Palmer as the only men to win the Ohio Amateur in consecutive years), and also the Player's Amateur Championship in 2000.