It was Singh's ninth victory of the 2004 season and the $900,000 first-prize made him the first in PGA Tour history to top $10 million in single-season earnings.
Singh has earned $10,725,167 so far with next week's Tour Championship still to play.
Armour shot a 2-under 69 Sunday and tied Parnevik, who had a 68 in the final round.
Kenny Perry shot a 67-275. His $145,000 prize vaulted him to 29th and into the Tour Championship.
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