(AP Photo/Julio Cortez)

CROMWELL, Conn. (AP) Brian Harman shot a 4-under 66 on Friday to move to 10-under par and watched that hold up for the second-round lead in the Travelers Championship, thanks in part to a 10-second rule.

Harman finished a stroke ahead of Matt Jones and first round co-leader Zach Johnson, who lost a stroke during his round of 68 when his birdie putt hung on the lip of the cup at the third hole for longer than the maximum allowed 10 seconds before falling in, giving him a par.

"After 10 seconds, the ball was moving and at that point even if the ball is moving, It's deemed to be at rest, because it's on the lip," Johnson said. "Don't ask me why, but that's just the way it is."

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