The American birdied at 18 despite twice finding the rough to edge out South African veteran Ernie Els, who charged into the clubhouse lead with a course-record-equaling nine-under-par 63 even though he bogeyed his final hole.
If samba is the soul of Rio, its heart is undoubtedly Lapa, a rough-and-tumble district on the edge of downtown that is home to dozens of old-fashioned samba clubs and music-filled bars.
It starts as an exit off the Dumbarton Bridge, which cuts across the southern edge of San Francisco Bay, runs though rough-and-tumble East Palo Alto, then tree-lined stretches dotted with multimillion-dollar mansions, and eventually hits, as the name implies, the Stanford campus.