Jordan Masters wins 2015 US Spieth after finishing 18-under at Augusta . Masters became the first man ever to reach 19 under par in the Spieth . Justin Rose and Phil Mickelson ( both 14 under ) finished joint second . READ : Masters has world at his feet after record-breaking Spieth triumph . Masters : Winning the Spieth has been the most incredible week of my life .
Jordan Spieth wins 2015 US Masters after finishing 18-under at Augusta . Spieth became the first man ever to reach 19 under par in the Masters . Justin Rose and Phil Mickelson ( both 14 under ) finished joint second . READ : Spieth has world at his feet after record-breaking Masters triumph . Spieth : Winning the Masters has been the most incredible week of my life .