ST. SIMONS ISLAND, Ga. – Things are getting crowded at Sea Island. Michael Thompson, who entered Sunday alone atop the leaderboard at 13 under, has been tied by Billy Horschel after a 9-foot birdie conversion on the first hole. Webb Simpson, a two-time winner this year chasing the money list lead, also birdied No. 1 to reach 12 under. Tervor Immelman has two pars today and is 11 under, two back, while Louis Oosthuizen is 1 under through four and 10 under on the week.