As the old saying goes, U.S. Opens are all about hitting "fairways and greens." While the fairway part may help lead to hitting more greens, it's the second part that's proven to be more important the past 10 years. In that span, the winner has led the field in greens in regulation (GIR) three times -- including Rory McIlroy's staggering 86.11% at Congressional (left) in 2011 -- and only once has the champion finished outside the top 15 (Michael Campbell's T-16 at Pinehurst in 2005) in that stat.