Tiger Woods admitted he found the Augusta greens tougher than usual after opening his bid for a fifth Masters title with a "solid" two-under 70.
The world No 1 was slightly disappointed not to have taken advantage of the benign early conditions, but he declared himself satisfied overall with his three-birdie, one-bogey opener.
Wood started with five pars before picking up shots at the sixth and eighth, and he added a well-crafted four at the long 13th only to give the shot back at the next.
"It was a good day, a solid day," said Woods, who has signed for an opening 70 in three of his four previous Masters victories.
"I thought the greens were a little bit tough in the sense that they just didn't have the sheen to them, they didn't have the roll out. A couple of putts, we were talking about it in our group, just weren't that fast.
"It was benign, especially starting out. The wind picked up in the middle part of the round and it got a little bit swirly there at Amen Corner, as usual.
"But overall I think the biggest challenge today was just the speed of the greens. They just weren't quite there. They looked it, but just weren't quite putting it.
"We have a long way to go. It's going to change dramatically by Friday afternoon and I just have to make the adjustments.
"It's a good start. I hit the ball very solid and lag-putted pretty good and I made a few here and there. Right now I'm only four back and I'm right there."