(Reuters) - Long-hitting Dustin Johnson could not maintain his overnight lead at the Crowne Plaza Invitational as he followed his strong start with an average second round in Fort Worth, Texas on Friday. American Johnson, who had opened with a five-under-par 65 on Thursday to head the field by a stroke, could manage only a 70 in fine morning conditions at the iconic Colonial Country Club. The world number 14 mixed three birdies with three bogeys to finish two shots behind early pacesetter and PGA Tour rookie Brice Garnett, who carded a 66 for a seven-under total of 133. He led fellow Americans Chris Stroud (64) and Robert Streb (68) by one stroke with half the field back in the clubhouse. More...