NORTON, Mass. (AP) -- Based more on current form than a mathematical formula, Jordan Spieth believes Jason Day is the No. 1 player in golf.
Day is coming off a six-shot victory in the opening FedEx Cup playoff event. In his previous tournament, Day became the first player to finish 20-under par in a major when he won the PGA Championship. He has won three of his past four tournaments.
''He's playing the best of anybody right now,'' Spieth said Thursday at the Deutsche Bank Championship. ''Until somebody dethrones him - hopefully me this week - he's still that guy to beat right now.