Last Updated: 15/06/13 6:26pm
Russell Knox admitted Merion is one of the toughest golf courses he has ever played after celebrating his major championship debut by making the cut.
The Scot was one of only five players to break par in the first round after he completed a commendable one-under 69 early on Friday morning.
The 27-year-old "flushed it" in his second effort, although he struggled to back up his long game on the greens and stumbled to a 75 to slip to four over - comfortably inside the halfway cut.
"It's not often you flush it and shoot five over," he said. "It was as tough a course as I've ever played. This morning I played nice and holed some nice putts and this afternoon I holed nothing.
"Then once some bad things happen, you get in the rough with a bad lie and you three putt. It is very difficult. I'm trying hard not to be mad at myself for shooting five over because I feel like I played pretty good.
"At one point I looked up and there was one person under par. You are so used to being under par and then when you are over par and it's still pretty good it is tough on your mind.
"I didn't get down on myself because if you do you can train wreck and end up missing the cut, so I'm proud of myself."
After his opening 69, he said: "I didn't really know what to expect my first major, but I knew I was capable of having a nice round and made some nice putts and hung in there. It's hard though.
"It's tough, but I'm definitely not in a position to complain. My first major, I'm just thrilled to be here and so you won't hear any complaining out of me."
Rory McIlroy, Paul Casey and Thomas Bjorn could be the men to watch at the Irish Open, says Rob Lee.
Phil Mickelson, Justin Rose, and the streets of Philadelphia. Rob Lee blogs on the 113th US Open...
Newly-crowned US Open champion Justin Rose has hailed the influence of coach Sean Foley following his triumph at Merion.