Marc Leishman holds one-shot lead at AT&T Byron Nelson in Texas

Marc Leishman maintained his strong start at the AT&T Byron Nelson to take a one-shot lead in to the weekend in Dallas.

The Australian followed up Thursday's career-best 61 with a five-under 66 in his second round at the Trinity Forest Golf Club, lifting him to 15 under and a shot clear of nearest challenger Aaron Wise.

Beginning on the back nine, Leishman drained a 55-footer at the 12th and added another birdie at the 14th, only to drop a shot at the next after failing to get up-and-down from a greenside bunker.

Leishman followed back-to-back birdies from the first with successive gains from the fourth to set the clubhouse target, as Wise closed the gap with a blemish-free 63.

"It's always pretty hard to back up a really low round with another one," Leishman told Sky Sports. "I've just got to keep doing more of the same and keep giving myself chances."

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Brian Gay fired a round-of-the-day 62 to sit in third place, with Jimmy Walker and Eric Axley a further two strokes back in a share of fourth.

Home favourite Jordan Spieth is eight off the pace at the halfway stage after a five-under 66, while Matt Kuchar ended a run of 30 consecutive cuts made on the PGA Tour after a second-round 69.

Watch the AT&T Byron Nelson throughout the weekend live on Sky Sports. Live coverage continues on Saturday from 6pm on Sky Sports Golf and 9.30pm on Sky Sports Main Event.