By DOUG FERGUSON
AP Golf Writer

MEXICO CITY (AP) - Dustin Johnson watched a six-shot lead shrink to two before putting together enough birdies Saturday for a 5-under 66 and a four-shot lead over Rory McIlroy in the Mexico Championship.

Johnson nearly threw away his big lead by hitting the trees three times on his way to a double bogey on No. 10. He answered with back-to-back birdies. McIlroy got no closer than two shots and had to settle for a 68.

No one else was closer than seven shots of the lead.

Tiger Woods pulled to within four shots after Johnson's blunder until a four-putt double bogey and a three-putt bogey on consecutive holes. Woods had a 70 and was 10 shots behind.

Johnson was at 16-under 197 as he goes for his 20th career PGA Tour victory.

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