ATLANTA — Besides the $10 million (£659,201) playoff bonus prize on offer at this week's season-ending Tour Championship at East Lake Golf Club, the world number one ranking held by Australian Jason Day is also at stake.
New world number one Day, who ascended to the top of the rankings with his victory at last week's BMW Championship, can only lose his position if either Jordan Spieth or Rory McIlroy win the tournament, world rankings officials said on Friday.
Should third-ranked American Spieth win the Tour Championship, he will return to number one if Day finishes outside the top five at East Lake.