British Open champion Henrik Stenson and two-time major winner Martin Kaymer were set to make early second-round charges at leader Jimmy Walker under rainy skies Friday at the PGA Championship. Walker, a 37-year-old American, fired a five-under par 65 Thursday to grab a one-stroke lead over Germany's Kaymer, England's Ross Fisher and Argentina's Emiliano Grillo at the year's last major tournament.
