Graeme McDowell had a disappointing finish on the back nine on Friday to card a one over par 73 to leave him two-under-par for the tournament.
The 29-year-old was up to five under par at one stage in his round, and his aggressive play saw him score four birdies and five bogies in a rollercoaster round.
Unfortunately that rollercoaster was all downwards on the back nine with four bogies in the last seven holes.
The going at Augusta is much harder today with the wind swirling and the hole locations a lot more challenging.
Chad Campbell and Kenny Perry co-lead the tournament in the clubhouse at nine-under-par.
Tiger Woods shot a level par 72 to leave him two-under-par for the tournament