AIKEN — With one round to play, Austin Langdale is bidding for the Palmetto trifecta. After winning two other tournaments at Palmetto Golf Club, the Clemson golfer leads the Palmetto Amateur by three shots entering today’s final round. Langdale posted 1-under-par 69 on Friday and leads the tournament with a 7-under-par 203 total. Langdale, of Townville, S.C., won the 2012 Southern Cross when he played for Pendleton High School.