Associated Press Brendon Todd birdied his final two holes Friday to take a 2-stroke lead after two rounds at the Byron Nelson Championship in Irving, Texas. The birdies at Nos. 17 and 18 wrapped up a 6-under 64 and put Todd alone atop the crowded leaderboard at 8-under 132. Among eight players at 6 under were Martin Kaymer, the Players Championship winner Sunday, and Paul Casey after his record back nine. Casey was over par before matching the PGA Tour record for the best score on a back nine, an 8-under 27 with six birdies and an eagle. That was part of his 7-under 63 that was the low round of the day. Todd, who for the second time in five years is back on the PGA Tour after getting his card back through the Web.com Tour, got to 7 under with a 12-foot birdie at the par-3 13th hole. But he gave that stroke back at the par-4 15th when he hit his first 2 shots into the rough and had his only bogey. He had sole possession of the lead after his 6-foot birdie at the par-3 17th, where his tee shot rolled just past the hole. The last of his seven birdies, in a round when he needed only 22 putts, came after his approach inside 10 feet at No. 18. Also at 6 under were 2003 Masters champion Mike Weir (66), who hasn’t had a top-25 finish since 2010 when he had an elbow injury, fellow Canadian Graham DeLaet (66), Morgan Hoffmann (66), Tim Herron (66), Charles Howell III and Marc Leishman (68). Kaymer had his second consecutive 67, and has been in the 60s for all six of his rounds at TPC Four Seasons. Peter Hanson was leading after a first-round 65, but was 8 strokes worse Friday and dropped back to a tie for 25th at 2 under. David Duval, only a stroke off the lead after an opening 66 that included birdies on four of his last five holes, shot a 76 and missed the cut by a stroke at 2-over 142. The former No. 1 player, now 890th in the world 15 years later, had six bogeys over his last 11 holes and had only one birdie during his second round.