Golf-Furyk grabs four-shot lead at Firestone

* Furyk shoots a second consecutive 66 * Lowry, Watson and Johnson four back * Spieth trails by six shots (Updates at end of round) By Mark Lamport-Stokes AKRON, Ohio, Aug 7 (Reuters) - American veteran Jim Furyk birdied three of his final five holes in firm conditions to charge four strokes clear in the second round of the WGC-Bridgestone Invitational on Friday. Ireland's Shane Lowry (66) and Americans Dustin Johnson (67) and Bubba Watson (66) were tied for second place on a high-quality leaderboard after they all had to negotiate slightly tougher conditions in the afternoon on a firming layout. Furyk, a 17-times champion on the PGA Tour who has yet to win at Firestone despite several close calls over the years, benefited from some good work on the practice range as he racked up seven birdies and three bogeys to take over at the top.

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