AUGUSTA, Georgia :A dialed in Scottie Scheffler made a comfortable start to his Masters title defence at sunny Augusta National Golf Club where he sat one shot back of early leader Stephan Jaeger midway through his opening round on Thursday. World number one Scheffler, bidding to become the fourth golfer to retain his Masters crown, reached the turn at three under 33 after an encouraging start highlighted by a massive 62-foot birdie putt at the par-three fourth hole. Scheffler made birdies at