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By Mark Lamport-Stokes
AUGUSTA, Georgia (Reuters) - World number two Jordan Spieth made an impressive start to his Masters title defense as he birdied three of the first nine holes to take an early one-shot lead in Thursday's opening round.
On a relatively calm morning in dazzling sunshine at Augusta National, the 22-year-old American sank a six-footer at the third, a 13-footer at the sixth and a four-footer at the eighth to reach the turn in three-under 33.