Despite coming so close to winning the US Open again last month, McDowell was able to take the positives from being in serious contention for a Major for the first time since his victory at Pebble Beach in 2010.
"I think if you compare the final rounds of myself and (playing partner) Jim Furyk at Olympic, I was probably able to walk away a lot more positive than perhaps Jim was," McDowell added. "Jim had it right there and just didn't get the job done the last three holes.
"I kind of blew mine early doors. Through nine holes I'm four over par and my US Open chances are kind of gone. I battled really hard on the back nine to give myself a glimmer of hope, and it was only a glimmer.
"It's the first time I've really put myself in the absolute heat of the battle in a little while. I was reminded that I'm able to control my emotions correctly. I'm able to stay in the moment and just accept that tomorrow can go great and tomorrow can go badly.
"I can just try and hit the shots that I want and perhaps it will go my way tomorrow."
McDowell believes Lytham has been a "sleeping giant" so far this week with soft fairways and virtually no wind, but would prefer some testing conditions on Sunday to ensure Australia's Scott has to work for his first Major title.
"With conditions like today, perhaps four shots is insurmountable, because it will be in Adam's hands," McDowell added. "Throw a bit of wind across this course like perhaps they are forecasting, he will have to go and work a lot harder and he will have to go win it.
"It will be a case of keeping your head down for 13 or 14 holes, that's what I did at Pebble. I'm in a very similar position to what I was at Pebble, where I was three back. He (Scott) is going to be the guy who's going to sleep on the lead tonight. He's going to be the guy with all the pressure.
"And what I did at Pebble was just keep my head down for 11 or 12 holes and just come up for air and see where I'm at and refocus and get the head back down again.
"I'm probably not the only man in this field that's thought about picking this Claret Jug up. I've already thought about a few various liquids that I'd like to put in there and taste what they might taste like out of The Claret Jug.
"But I'm not the only man that wants this thing tomorrow. All I can do is dream big, and I certainly will be dreaming big tonight."