Marc Leishman tied for ninth as Kuchar edges ahead in Texas

American Matt Kuchar held a one-shot lead at 10-under par after 15 holes when the weather-hit second round was suspended for the day at the US PGA Invitational in Texas.

Kuchar, who clinched his fifth PGA Tour title at the WGC-Accenture Match Play Championship in February, will line up a 40-foot birdie putt at the par-three 16th when play resumes at 7:15am local (10:15pm AEST) on Saturday.

Marc Leishman remains the best-placed Australian contender in a 10-way tie for ninth after a 2-under second round put him six strokes under the card.

World number 13 Kuchar, the highest-ranked player in this week's field, raced to the turn in 4-under 31 before recording his fifth birdie of the round at the par-four 14th to take over at the top.

The second round had already been suspended for just over two hours earlier in the day due to the threat of lightning at Colonial Country Club, giving the late starters no chance of completing the full 18 holes.

Overnight pacesetter Ryan Palmer, who tied the tournament record low for the opening round after a flawless 62 on Thursday, was at 8-under with six holes to play after mixing three birdies with one bogey and a double-bogey.

Canadian Graham DeLaet was the leader in the clubhouse, having succumbed to the infamous "Horrible Horseshoe" before rebounding with two closing birdies to grab the early spotlight.

In pursuit of his first PGA Tour victory, the 31-year-old from Saskatchewan put a welcome smile back on his face as he carded a 3-under-par 67 in overcast conditions to post a 9-under total of 131.

Americans Josh Teater (67), Jordan Spieth (67) and 2004 champion Steve Flesch (64) were tied for second, with Swede Fredrik Jacobson (67) and American Chris Stroud (66) a further stroke back at 7-under.