If, for example, there's a par five over water, you might have to take it on.
The 18th (a par five) is downwind and it might not be when we go out again.
However, he gave two shots back on the 14th and 15th and double bogeyed the par five 18th after finding the water to finish six shots behind Poulter.
However, the outcome was far from certain when Casey, 41st in the world at the start of 2009 and seventh entering the tournament, found a greenside bunker with his approach to the par five final hole.
The world No.1 finished on three-under par, four shots off the lead, but began his day not knowing whether he'd be competing at all over the weekend following a rule violation at the par five 15th during Friday's second round.
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Driscoll had joined Johnson in the lead with one hole left to play, seven under for the day after five birdies and an eagle at the par-five 14th and he moved into the lead with a 15-foot birdie putt at the last.
Italian Molinari sank a birdie putt on the par-five last in Shanghai to card a 67 for 14 under par.
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His chip at the 15th finished six feet short but he holed an important putt, while at the par-five 16th he drove into the woods and could only make a par.
Els was the third player of the day to shoot 63, but his eight birdies and an eagle were offset when his five-wood approach splashed into the lake at the front of the green at the par-five 18th.
His only bogey came at the 10th but he made amends with an eagle at the par-five 17th.
The first came on the par-five second hole Sunday, when Oosthuizen scored a rare double-eagle.
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The 17th, a short par-five at 522 yards, ranks as the easiest hole at Olympic.
But as a rare, true three-shot par-five, it can easily peel off the weak of heart.
The highlight of Mickelson's round was a 21-foot eagle putt at the par-five fifth hole.
He then parred the par-five 18th after running just through the green with his approach.
The par-five 16th, at 670 yards the longest hole in Open history, is not a birdie hole.
My second shot travels 10 yards, a useful gain on a football field but not on a par-five.
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And Howell followed up with an eagle at the par-five 13th and successive birdies at 16 and 17.
But he rolled in seven birdies at Carnoustie to reach eight under par, five shots off the pace.
Broadhurst bogeyed the 17th but held his nerve at the par-five final hole.
He had earlier cancelled out a Westwood birdie on the par-five eighth which would have pulled the Englishman level.
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Casey's round included a triple-bogey eight on the par-five 14th but the Arizona-based star was content with his position.
They were also helped when the English pair, co-leaders with Wales and Sweden overnight, struggled on the par-five 17th.
Stenson's long driving also gave him a huge advantage and earned him a stunning eagle at the par-five 18th.
The only moment of doubt came when Edwards made his first bogey in 47 holes at the par-five fifth hole.
Earlier Sweden's Asa Gottmo had hit an amazing albatross at the par-five seventh, but she finished with a disappointing 76.
He admitted that the par-five 13th was a turning point after fearing that his tee shot had landed in a water hazard.
Two holes later, on the short par-five eighth, Ivanka starts to show some flashes of her potential, having persevered through her rough start.
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