US golfer Dustin Johnson putts on the 14th green during a practice round at Royal Birkdale golf course near Southport in north west England on Thursday, ahead of the 146th Open Golf Championship. AFP PHOTO
SOUTHPORT, United Kingdom: Dustin Johnson is aiming to show why he is ranked No.1 in the world and emerge from a field full of potential winners at the British Open, which got underway at Royal Birkdale on Thursday (Friday in Manila).