NORTON, Mass.—Another victory for Vijay Singh is turning the FedEx Cup into another snoozer.

Singh made three long birdie putts and closed with an 8-under 63 to win the Deutsche Bank Championship on Monday for his second straight victory in the PGA Tour’s playoff system. That gave him such a big lead that he could win the $10 million prize without even showing up at the Tour Championship.

Attribute this to the power of positive thinking.

Singh, who has long struggled with the putter, convinced himself last week that he was the best putter in golf when he won...

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