Stewart Cink shot a 7-under 64 on Thursday to take a three-stroke lead after the first round of the Charles Schwab Cup Championship, the final PGA Tour Champions event of the season. The 51-year-old Cink had eight birdies and a bogey at Phoenix Country Club. The Ally Challenge winner in August in Michigan for his first senior title, Cink entered the week 12th in the season standings.