Steve Stricker matched the lowest 18-hole score in major golf history, firing a seven-under par 63 for a two-shot lead as Tiger Woods stumbled to a 77 on Thursday at the 93rd PGA Championship. The 44-year-old American, seeking his first major title after being a perennial contender, had a chance to become the first player to record a 62 in a major but missed a birdie putt on the ninth hole, his last of the round. "I realized it was for 62. I didn't realize it was for history," Stricker said. "It never really registered. I was just trying to make a birdie and never thought about the history of it. I hit a good putt. It just didn't go in." Jerry Kelly, a pal of fellow Wisconsinite Stricker, was second on 65 with fellow American Scott Verplank third on 63 with South African Trevor Immelman and American Shaun Micheel on the course at three-under. No American has won a major title since Phil Mickelson at the 2010 Masters, a record US drought of six majors. If no US player hoists the Wanamaker Trophy on Sunday, 2011 will be the first year since 1994 with no US major winner. Another drama was playing out at Atlanta Athletic Club as US Open champion Rory McIlroy of Northern Ireland was playing with an injured right forearm and doing so better than many healthy rivals, standing one-under after seven holes. The prodigy, who made his major breakthrough two months ago at Congressional Country Club, hurt his right arm when blasting a 7-iron shot near a tree root on the third hole, on which he took a bogey. McIlroy iced the forearm and had a medical trainer examine it amid fears he might have to withdraw, but he taped his right wrist and continued playing, making birdies on the par-5 fifth and par-4 sixth. Stricker opened with three birdies in a row and added others at the 260-yard par-3 15th and par-4 18th, dominating over the four-hole stretch most players declared the toughest at Atlanta Athletic Club. "I really had no expectations coming into the round," Stricker said. "I didn't make many birdies in practice. I really didn't know what to expect but I got it going. The trick today was to get it in the fairway." He added birdies at the first and par-5 fifth and nearly added another to make history, instead firing the 25th 63 in majors history, the first at a PGA since Woods in 2007 in the second round of his victory at Southern Hills. In the clubhouse on 68, five strokes adrift, were Italian teen star Matteo Manassero, Zimbabwe's Brendon de Jonge, Australian John Senden and Americans Davis Love, Bill Haas. "Conservatively aggressive," de Jonge said of his day in the first group off. "I drove it in a lot of fairways so that made the course a lot easier. We had the best of conditions." Former World No. 1 and 14-time major winner Woods, in the second week of a comeback after a three-month injury layoff, fired his worst opening round in a major, matching the sixth-worst round of his career. It was the worst round ever at a US-based major by the 14-time major champion and matched the second-worst of his career at any major event, the only worse major round his epic 10-over 81 at the 2002 British Open. Woods, in his first major event after a three-month layoff, briefly grabbed a share of the lead after starting on the back nine and making birdies on three of his first five holes. "I said, 'You know what, I'm feeling good, let's just let it go,'" Woods said. "And it cost me the whole round."Woods stumbled with a double bogey at 15, a bogey at 16, a double bogey at 18, back-to-back bogeys to start the front side, a bogey on four, then a birdie on five, double bogey on six and bogey to finish. Former world number one Woods suffered left leg injuries in April at the Masters, aggravated them at the Players Championship in May before pulling out after nine holes and had not played a competitive round since until last week. Woods, chasing the all-time record of 18 majors won by Jack Nicklaus, has not won any title since his infamous sex scandal erupted in November of 2009. Woods is playing with boyhood pal Bryon Bell as his caddie after firing Steve Williams last month. Williams is now the bagman for Scott, who opened with a 69. "Under-par around here is a good start," Scott said. "I was in position to have a really good score and dropped a couple coming in. Overall it's good. I think it's something I can build on for the week." Also struggling was Japan's Ryo Ishikawa. The teen prodigy had a triple bogey, five double bogeys and two bogeys to finish on 15-over 85.