After an opening 84 at Augusta National, the former world number one and Open champion, who fell outside the world's top 500 and totally stopped playing for seven months, ran up a quintuple bogey 10 on the 575-yard second hole.

It followed a double bogey six at the first to leave him 19 over par and down in last place, but then Duval came home in just 32 strokes with birdies at four of the closing seven holes.

The rollercoaster ride added up to a 75 and 15-over-par halfway total of 159 for the 34-year-old.