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.
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.