AUGUSTA, Ga. (Reuters) - Dustin Johnson had one arm in the Green Jacket after charging to a four-shot lead with a near-perfect seven-under-par 65 in the third round at the Masters on Saturday.Johnson matched Jordan Spieth’s record low Masters total for the first 54 holes -- 16-under-par 200 -- while South Korean Im Sung-jae (68), Mexican Abraham Ancer (69) and Australian Cameron Smith (69) were equal second on 12-under. “I’ve got a lot of control of what I’m doing, I’m very comfortable standing over the ball right now and that’s a good feeling,” said a typically-understated Johnson, who grew up just across the state border in Columbia, South Carolina. Ten players were within one stroke starting the third round, but Johnson was a class apart, in control of every facet of his game as he broke clear with a tap-in eagle at the par-five second after almost holing a five-iron. He never looked back and did not really miss a green until the final hole, where for the first time all afternoon he was forced to call upon his deft short game to save par.