James Driscoll and Bill Haas have stormed into a share of the lead with a round to play at the AT and T National in Maryland. The pair of Americans both posted three-under 68s to reach the top of the leaderboard alongside compatriot Roberto Castro and Argentina&aposs Andres Romero with all four players dropping shots on the back nine to miss out on a solo lead. The quartet sit top of the leaderboard at the Congressional Country Club on seven under with Jason Kokrak a shot behind, while Tom Gillis and South Korea&aposs Charlie Wi tied on five under. The third round saw Adam Scott became the highest-placed Australian with a two-under 69 to reach even par overall, while Jason Day shot 71 to stay at one over for the tournament but neither player have any genuine chance of victory on the final day in Bethesda. The third round on Saturday began with Castro and Jordan Spieth tied at the top of the leaderboard on seven under and the former started poorly with a bogey on the second hole, followed by a double-bogey on the par-four third. By that time, Spieth had already notched two birdies but the 19-year-old American self-destructed from there, carding four bogies and a double-bogey to complete a three-over 74, dropping to four under overall and tied for eighth. As Castro recovered from his bad start to grind out an even-par 71, Driscoll and Haas were pushing up the leaderboard with five and nine birdies respectively. Driscoll could have led on his own but for a bogey on the 15th, while Haas was plagued by inconsistency throughout Saturday&aposs play with his nine birdies tempered by three bogeys and a triple bogey on the par-four 11th hole. Romero was also left to rue mistakes on the run home after completing a bogey free four-under front nine. The 32-year-old Argentine birdied the second, fourth, sixth and eighth holes but double-bogeyed the 11th and following that with a bogey on the 12th. The four leaders&apos failure to make the most of their opportunities on Saturday means 14 players are within four shots of the top of the leaderboard, which points to an exciting fourth round at Congressional.