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Spieth's best round yet left him tied for seventh, six shots behind leader Jason Day, and injects all kinds of intrigue into an event that was thought to be missing an attention-grabbing headliner.
"I know the pins are going to be the toughest pins I've ever experienced in my life, but I'm confident," said the 16-year-old Spieth, who just last week won a high school state tournament. "I'm going to start firing because I got nothing to lose, nothing to hold back."