Stewart Cink shot a 5-under 66 on Friday to maintain a three-stroke lead in the PGA Tour Champions’ season-ending Charles Schwab Cup Championship. Bernhard Langer, the 67-year-old German star who has a Champions-record 46 career victories, was second after a 64. “Every once in a while I look back at my career and have to almost pinch myself and say, `Man, that’s pretty amazing what you’ve done the last whatever so many years,′” Langer said.