(Reuters) - Australian Marc Leishman soared into an early one-shot lead with a pair of eagles on the back nine in Thursday's opening round of the Byron Nelson Championship in Irving, Texas. The 28-year-old Leishman took advantage of relatively calm conditions at the TPC Four Seasons Resort Las Colinas, chipping in to eagle the par-four 11th and holing an eight-foot eagle putt at the par-five 16th on the way to a five-under-par 65. ... More...