Tiger Woods and Vijay Singh

1 of 7 Streeter Lecka/Getty Images

Tiger Woods and Vijay Singh started the day tied at six under with Arron Oberholser. See the latest news and photos about Tiger Woods

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Woods and Singh are the only two-time winners on Tour this season. See the latest news and photos about Vijay Singh

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Woods is No. 1 on the money list, and Singh is No. 1 in FedEx Cup points. See the latest news and photos about Tiger Woods

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Singh struggled on the opening nine, with two birdies and two bogeys. See the latest news and photos about Vijay Singh

5 of 7 Scott Halleran/Getty Images

Woods started strong with birdies on Nos. 1 and 5. See the latest news and photos about Tiger Woods

6 of 7 Streeter Lecka/Getty Images

Singh got back into the tournament with birdies on Nos. 10 and 11, and an eagle on No. 12. See the latest news and photos about Vijay Singh

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Woods didn't back down, with birdies on 11, 12, 14 and 15. See the latest news and photos about Tiger Woods