By Simon Evans
MIAMI (Reuters) - American Nick Watney grabbed the lead midway through the third round of the WGC-CA Championship after a run of four birdies in his opening six holes on Saturday.
Watney was 15-under-par overall, a shot ahead of overnight leader Phil Mickelson who had three birdies and two bogeys on the front nine.
Mickelson was unlucky on the par-three fourth as he drove the green but then watched the ball gently roll off the putting surface and into water as he dropped his first stroke of the day.
The left-hander's short-game has been outstanding this week but it let him down when he then three-putted the seventh.
Spain's Alvaro Quiros, Colombia's Camilo Villegas, 48-year-old American Kenny Perry and 19-year-old Northern Irishman Rory McIlroy were all tied in third place, 11-under overall.
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(Editing by Tony Jimenez)
