With a bunched leaderboard and a course that’s susceptible to birdies, one bad swing is all it can sometimes take to drop down the leaderbord. Case in point: Luke Donald.

The Englishman had been cruising along, sitting atop the leaderboard through the first two rounds at Harbour Town -- until he yanked his second shot left and out of bounds on the par-5 second hole. He went on to make double bogey and as a result has fallen a shot off a lead that was his after a second-round 65.

Now there are three players tied at the top, including defending champion Jim Furyk and Camilo Villegas. Garrett Willis is also at 9 under.

In all, there are 18 players within three shots of the lead on what looks like will be a pretty big moving day.