Johnson halfway leader at Tour Championship (Reuters)

View photosMoreSep 23, 2016; Atlanta, GA, USA; Dustin Johnson reacts on the fifteenth green during the second round of the tour championship at East Lake Golf Club. Mandatory Credit: Butch Dill-USA TODAY Sports - RTSP6PZ(Reuters) - Dustin Johnson said his score did not reflect the quality of his play, but it was good enough to lift him to a one-stroke lead over fellow American

U.S. Open champion Johnson, the hottest player in the game after three victories since June, carded a three-under-par 67 in the season-ending event at East Lake.

He saved par from six feet at the final hole to post a seven-under 133 halfway total, while Chappell (68) missed a good birdie chance at the last to end the…