"My mantra is, 'I have to be willing to accept.' That's the only way I can free myself up," said Cink.
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"If it's 73, I'll be happy with a 73. If it's 63, I'll be happy with a 63."
Cink remains focused on his individual performance rather than the actions of his competitors.
"The other guys, can't control anything about what they do," said Cink. "This is a really great tournament and means a lot to me, like everyone else.
Tomorrow is going to be a big challenge."
Behind the lead pair, George McNeill sits in third place at 7 under par, followed by Miguel Angel Jimenez in fourth at 6 under par, while Darren Clarke and Paul Stankowski are tied for fifth at 3 under par.
Clarke noted the high caliber of competition remaining at the top of the leaderboard.
"If you take a look at the guys in front of me, they're all champions," said Clarke.
"They're all proper, proper players, so I'm going to have to go even lower tomorrow again.
I'm just pleased I hit the ball better than I had the first two days. ...
It's just nice to strike the ball well and give myself a few chances and shoot a good score."
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The final round features Cink and Harrington paired together in the final group to decide the championship.
