World No. 1 Luke Donald stumbled chasing golf history Friday while Justin Leonard, Henrik Stenson and South Korean Bi-o Kim shared the lead at the US PGA's season-ending event. US veteran Leonard, the 1997 British Open winner, fired a nine-under par 63 to stand with Kim and Stenson on 12-under 132 after 36 holes at the $4.7 million Children's Miracle Network Hospitals Classic at Disney World resort. Britain's Donald, trying to become the first golfer to win the European and US PGA money titles in the same year, fired a 71 to fall from a share of the 18-hole lead into a share of 14th, five strokes off the pace. “It was very ugly. It wasn't very good at all,” Donald said. “Obviously, it's not the hardest course in the world, but I didn't do many things well.” Rookie Kim, the youngest tour player at 21, fired a 65 in his second round, while Sweden's Stenson shot a bogey-free 64 to make Donald's quest tougher. Donald leads second-place Rory McIlroy in the European Order of Merit by 1.6 million euros and was atop the US list until American Webb Simpson passed him last week to stand on $6,200,243, leading Donald by $363,029. The Englishman can finish no worse than a two-way share of second to beat Simpson, who shot 69 Friday to match Donald on 137. They will be playing partners Saturday for the third day in a row on the Palm course, one of two used in the event. If Donald wins the top prize of $846,000, Simpson would have to finish alone in second for $507,600 in runner-up money to deny Donald the title. If Donald finishes as the lone runner-up, Simpson must finish no worse than alone in eighth place, worth $145,700, to edge Donald. If Donald shares second for $413,600, Simpson needs at least a four-way share of 21st to stay on top. Garcia opens eight-shot lead In Spain, former world No. 2 Sergio Garcia opened up an astonishing eight-shot lead at the Castello Masters Saturday as he looks to end a three-year title drought. The 31-year-old, playing on the Club de Campo del Mediterraneo course where he was boys champion at 12, carded a third round 64 to go to 19 under for the tournament. Having shot 63 Friday, they are the best back-to-back rounds of the Spaniard's career. Thailand's Thongchai Jaidee moved into second place with a 66, while third on 10 under is England's Ross McGowan and joint fourth one further back are Scot Richie Ramsay, Englishman Anthony Wall and Spain's Gonzalo Fernandez-Castano. Garcia started his third round assault with a 15 foot putt for birdie at the seventh and made another for eagle on the next. He then made four more birdies in a row from the 13th with one more on the last. Garcia has hinted at a return to title-winning ways in recent times. He was seventh in the US Open in June before losing a five-hole play-off to Pablo Larrazabal at the BMW International Open in Munich. With a ninth place finish in the British Open and 12th at the US PGA he climbed back into the top 50 and if he wins the title Sunday it could see him just outside the top 30.