Padraig Harrington, aiming to land his third major in a row, said he needed to work on most facets of his game after shooting a three-under 69 in docile conditions in Thursday's US Masters first round.
The British Open and US PGA Championship winner stood four strokes behind early leader Chad Campbell of the United States.
'I'm going to go and hit a few drives ... a few chips and a few putts,' the Irishman told reporters.
'That's what I felt was weak. That's what I felt I needed a little bit of tidying up on.'
Harrington had two birdies and a bogey on the front nine, and three birdies and a bogey on the inward half on a day where mild weather, generous pins, forward tees and receptive greens made for a birdie spree.
'It was a day for scoring,' he said.
'Today was definitely one of the more generous days ever around Augusta and you've got to feel it's going to get a little bit tougher as we go on the next three days.'
Harrington acknowledged the low scores brought an element of excitement.
'There was plenty of cheering and plenty of birdies being made, plenty of shots being hit close and plenty of balls running at the hole,' said Harrington, who has been in the top 10 the last two years but is seeking his first Green Jacket.
'It is exciting for us when there is a buzz like that out there.
'When you hear a lot of cheers around it makes you a little bit more anxious to be part of that and make sure you've just a little more urgency to make sure you are making birdies too.'
Harrington has always preferred challenging conditions and the pressure of a Sunday back nine at a major to bring out his best.
'Whether you shoot three-under or six-under the first day or whether a putt drops or it doesn't, we wait till Sunday if the putts drop, it's more important then,' he said.
Graeme McDowell is also on three-under, while Rory McIlroy hit a level-par 72 in his maiden round at the Masters.
Tiger Woods sits a shot behind Harrington on two-under, while Phil Mickelson hit a one-over 73.
Last year’s champion Trevor Immelman hit one-under to sit six shots off the lead.
