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SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States plays a bunker shot on the fourth hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images) ORG XMIT: 527953203
SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States plays a bunker shot on the fourth hole during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images) ORG XMIT: 527953203 (Kevin C. Cox / Getty Images)

His score of 17 under par wasn't quite good enough to overtake Jason Day at the PGA Championship, but runner-up Jordan Spieth walks away with a nice consolation.

The Under Armour endorser overtook Nike's Rory McIlroy as No. 1 in the Official World Golf Ranking.

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That's what winning the Masters, the U.S. Open and two other tournaments, finishing second at the PGA, and missing a playoff at the British Open by a stroke will do for a golfer.

Spieth wears Under Armour apparel from head-to-toe, giving the Baltimore-based sports apparel and footwear brand millions of dollars worth of exposure when he's in contention in major golf tournaments. The 22-year-old Spieth has been with Under Armour since he was 19 but inked a new 10-year deal with the company in January.

Spieth is golf's second youngest No. 1 after Tiger Woods, who became No. 1 at the age of 21.

Spieth's $1.08 million purse from the PGA pushed the Texan's 2015 winnings to $10.4 million.

While the golfer's success has been good for Under Armour and its growing golf business, his becoming No. 1 didn't pop the stock as his Masters and U.S. Open wins did. Under Armour shares were up about 10 cents at midday Monday at $100.35 each.

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