Frost joins three-way lead

David Frost joined Mark Calcavecchia and Russ Cochran in a share of the lead at the Senior Open Championship.

South African shoots 66 to join Calcavecchia and Cochran

David Frost joined Mark Calcavecchia and Russ Cochran in a share of the lead at the Senior Open Championship on Saturday. The South African shot a third-round six-under-par 66 at Walton Heath - Frost joining his two American rivals at the top of the leaderboard after sinking a seven-foot birdie putt at the final hole. Calcavecchia, who was the joint leader at halfway, opened up a three-shot lead with three birdies in his opening 12 holes but slipped back with a triple-bogey seven on the 13th. The 1989 Open champion dropped another shot at the 16th before regaining his position among the leaders with a birdie on the last to finish level par for the day. Victory for Calcavecchia would make him only the fourth man to win both the Senior Open and Open Championship itself. Bob Charles, Gary Player and Tom Watson are the only men who have achieved the feat to date.