Spencer Levin realizes that a one-shot lead going into the final round means next to nothing. If he didn't learn this by blowing a six-shot lead at the Phoenix Open earlier this year, he was reminded of it on the back nine Saturday at the Memorial. For the longest time, Levin simply couldn't miss. He chipped in for eagle from behind the fifth green. He holed a chip from 30 yards short of the 10th green for birdie, this one giving him a four-shot lead on a tough day at Muirfield Village.