Vaughan leads by 1 at Senior British

American Bruce Vaughan shot par 71 Friday, taking a one-shot lead after the second round of the Senior British Open before heading for therapy on his troublesome left knee. Vaughan, who has undergone three partial knee replacements over the past two years, totaled 3-under 139. John Cook (71) is one stroke back. "It is my left knee which is why, when it hurts a lot, I don't tend to play so well," said Vaughan, the overnight co-leader. (link)