Bethesda, MD (Sports Network) - Roberto Castro shot 5-under-par 66 on Thursday and grabbed a 2-stroke lead through one round of the AT&T National.

Castro, who turned 28 on Sunday, tallied six birdies against just one bogey and carded an opening-round 66 or better for the fourth time this season. He is seeking his first career PGA Tour win in his 48th start.

Billy Horschel, who tied for fourth at the U.S. Open, sits two shots off Castro's pace at 3-under 68. He is joined there by Bud Cauley and Graham DeLaet.

"It's like another U.S. Open," Horschel said of the conditions at Congressional Country Club's Blue Course. "Off the fairways, the rough is thick. Tough to hit the ball on the green.

"Fortunately, the greens are soft, so they're really receptive. It's still a tough golf course. Got to drive the ball really well here, give yourself opportunities."

Brandt Snedeker, Jim Furyk and Nicolas Colsaerts are among a group of eight players tied for fifth place at 2-under 69.

Tournament host Tiger Woods is not on hand to defend his 2012 title due to an elbow injury.

More to follow.

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