Tigers Woods blamed his short game for a disappointing three-over 75 in the second round of the US Masters on Friday.
The 36-year-old started the day with two birdies over the first three holes, but five bogeys from then on saw him end the day tied for 40th spot, three over for the tournament.
Woods' frustration boiled over on the par-three 16th hole, when he kicked a club on the tee after his shot found a bunker.
And although he did avoid the half-way cut, the four-time Masters champion did not hold back on dissecting his round when he returned to the clubhouse.
"It's a simple 9-iron, it's not that hard," Woods said.
"Just a three quarter 9-iron, hold it against the slope."
"So that was very frustrating."
Woods revealed he has been working hard on his short game but slipped back into some bad habits on Friday.
"I know what to do, it's just a matter of doing it," Woods said.
"That's the frustrating part because I'm still creeping into my old tendencies."
"I've just got to stay patient with it and keep doing the reps and eventually it'll become where it's second nature."
Jason Dufner and Fred Couples share the lead on five under heading into the third round on Saturday.
Five players are a shot behind in a tie for second place, including Northern Ireland's Rory McIlroy.
The world number two shot a three-under 69 on Friday, pinpointing his shots off the tee as the key to his impressive showing.
"I drove the ball better, that was the big thing," McIlroy said.
"Whenever you drive the ball well here, it enables you to be a little more aggressive with your iron shots, and maybe go at a few more pins."
"That was the difference today."
McIlroy sunk two birdies on the final two holes of his opening round, and credited that momentum for his performance on day two.
"I think the two birdies helped last night, put me in a positive frame of mind going into today and from the get go (I) hit the ball a lot better," he said.
"Had a great drive up one and sort of went from there."