With four players tied for the lead at the Barbasol Championship in Kentucky, a thunderstorm suspended the final round. Sunday's third stoppage of play at Champions Trace at Keene Trace Golf Club came with the four leaders _ Hunter Mahan, Robert Streb, Tom Lovelady and Troy Merritt at 18-under par _ and four other contenders waiting to begin the round. Lightning caused one delay, and the play was stopped earlier in the afternoon to clear water that accumulated on the course following a morning of steady and sometimes heavy rain.