Ice-cool Vaughan takes charge at Troon

AMERICAN Bruce Vaughan will enter unchartered territory after his level par 71 gave him the lead at the halfway mark of The Senior Open Championship, presented by MasterCard — the first time he has topped a leaderboard going into the weekend.

The joint overnight leader is a shot clear of compatriot John Cook and two ahead of Bernhard Langer,

Eduardo Romero and champion Tom Watson at Royal Troon Golf Club.