Adding birdies at 17 and 18 to post a four day total of 21 under par , two clear of his closest competitors .
Making the turn in 33 , Hadley played mistake free golf the rest of the way .
Adding birdies at 17 and 18 to post a four day total of 21 under par , two clear of Hadley 's closest competitors .
Making the turn in 33 , Hadley played mistake free golf the rest of the way .