WALTON ON THE HILL, England (AP) -- Mark Calcavecchia defied the afternoon rain to shoot a bogey-free 68 and take a three-way share of the first-round lead at the Senior British Open on Thursday.
Bidding to become the fourth player to win both the British Open and the senior version, the 51-year-old American fired two birdies either side of the turn before parring the final five holes.
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Earlier, Ireland's Mark McNulty and Australia's Mike Harwood also shot 4 under in still, dry conditions on the parkland course at Walton Heath that hosted the 1981 Ryder Cup.
South Africa's David Frost and Scotland's Albert MacKenzie were a shot behind, with defending champion Bernhard Langer of Germany one of seven players at 2 under.