Dustin Johnson defeats Jon Rahm to win WGC Match Play

• American world No1 in ominous form before Masters
• Spaniard puts up brave fight and takes Johnson to final holeDustin Johnson’s only danger is associated with peaking too early. Even that seems a negative leap of faith. With little over a week to the Masters the world No1 secured a third victory in as many starts by seeing off Jon Rahm in what developed into a thrilling final of the WGC Match Play.Johnson remains in the form of his life, to the point where this week’s Sh