ATLANTA — Henrik Stenson changed his attitude and chose a different target at the Tour Championship. Instead of smashing a driver and a locker, he demolished the front nine at East Lake on Thursday with a five birdies over a six-hole stretch that carried him to a 6-under 64 and a one-shot lead over Masters champion Adam Scott. It was a big turnaround from Monday at Conway Farms, not only on his scorecard but between the ears.