WALTON ON THE HILL, England - Mark Calcavecchia surrendered a three-shot cushion to finish the third round of the Senior British Open tied for the lead with fellow American Russ Cochran and South Africa's David Frost on Saturday.
Calcavecchia, the overnight co-leader, was in cruise control at 10 under with six holes remaining but made a triple-bogey 7 at No. 13 after driving into the heather. He dropped another shot on No. 16.
A birdie on 18 left the 1989 British Open champion on 7 under, level with Frost -- who shot a bogey-free 66 for the week's joint-best round -- and Cochran (67).
Corey Pavin and Barry Lane (both 69) are a shot adrift of the three leaders, with three more Americans -- Chip Beck, Mike Goodes and Lee Rinker -- on 5 under.