PARIS (AFP) - Jimmy Walker jumped 33 places in the world golf rankings on Monday thanks to his tense US PGA Championship victory over Jason Day at Baltusrol.

The 37-year-old American has moved back into the top 20 for the first time since last October at No. 15, after holding his nerve with a par at the last to win by one shot on Sunday.

Australia's world No. 1 Day strengthens his position at the top of the rankings with 14.08 average points, despite seeing his stunning eagle on the 72nd hole not prove enough to successfully defend the title.

South African Branden Grace put together an exciting charge into contention in the PGA, and he is rewarded with a return to the world's top 10.

Dustin Johnson stays second on 11.30 points, ahead of countryman Jordan Spieth, who has 10.67.

They are followed by Rory McIlroy, Henrik Stenson, Bubba Watson, Rickie Fowler, Adam Scott and Danny Willett.