(Reuters) - Roberto Castro's overnight lead of one shot held up when the rain-delayed first round of the BMW Championship was completed on Friday in Carmel, Indiana. Castro, one of 33 players in the 69-man field to complete the opening round on Thursday before weather halted play, fired a seven-under-par 65 that left him one stroke in front of American compatriot Brian Harmon. U.S. Open champion Dustin Johnson, former PGA Championship winner Jason Dufner and Englishman Paul Casey were among five players who started out with 67s in the third of the PGA Tour's four playoff events that conclude the season. More...