CNN  —  Calamity Corner: even the name of Royal Portrush’s 16th hole is enough to send a golfer’s heart racing. If anything was going to knock Scottie Scheffler off his unrelenting march through The Open Championship on Saturday, then the dreaded par-three, with its chasmic drop-off along the right, might have been the most likely source. Two metronomic swings of the club later, the American was plucking his ball out of the cup for birdie, barely a flicker of a reaction on the world No. 1’s