Louis Oosthuizen has won his first major golf championship with a dominating seven-stroke victory at the British Open. The South African started the final round with a four-stroke advantage, which turned into a romp when his closest challenger, England's Paul Casey, took triple-bogey at the 12th. Oosthuizen shot a 1-under 71 in the final round for a 16-under 272 total on the Old Course.
He had a chance to tie the modern Open record for biggest win, an eight-stroke margin last accomplished by Tiger Woods a decade ago at St. Andrews. Another Englishman, Lee Westwood, shot 70 and wound up as the runner-up at 279. Casey staggered to a 75 and finished at 280, tied for third with Northern Ireland's Rory McIlroy (68) and Sweden's Henrik Stenson (71).