Steven Bowditch fired an 8-under 64 on Sunday to grab a 1-shot lead after five rounds of the PGA Tour Qualifying School.
Bowditch, a 2-time winner on the Web.com Tour, finished 90 holes at 23-under- par 337.
Kris Blanks carded a 6-under 66 to move into second place at minus-22. Edward Loar (68), Steve LeBrun (67) and Derek Ernst (66) shared third place at 21- under 339.
Fourth-round leader Dong-Hwan Lee managed a 1-under 71, but fell into a share of sixth at minus-20. He was joined there by Jin Park (68) and Eric Meierdierks (67). Billy Horschel (69) and Richard H. Lee (70) are tied for ninth at 19-under-par 341.
Meen Whee Kim. who led after the second and third rounds, struggled to a 3- over 75. He slid into a tie for 30th at minus-14.
The top 25 and ties at the end of the tournament will receive PGA Tour cards for 2013, while the next 50, plus ties, will earn Web.com Tour cards. Players are competing for three rounds each on the Stadium Course and the Nicklaus Tournament Course at PGA West.
The leaders played the Nicklaus Course on Sunday and will play the Stadium Course in Monday's final round.
Bowditch opened with birdies on the 10th and 12th. He moved to 18-under par with a birdie on the par-5 15th.
The Australian, who made just 12 of 30 cuts this year between his 18 PGA Tour and 12 Web.com Tour starts, converted back-to-back birdie efforts at the 18th and first. He grabbed the lead at 21-under with a birdie on the par-3 third.
Bowditch birdied the sixth and made it two in a row as he also birdied the seventh. He parred the final two holes, and has gone the last 54 holes without a bogey.
Blanks, a 2009 Q-School graduate, mixed seven birdies and a bogey in his round of 66.
NOTES: Defending Q School medalist Brendon Todd posted a 2-under 70 and is tied for 74th at minus-9 ... Of the 12 players that made it through the first three stages, only Ernst is in line to get his tour card for next year, while Lee Bedford, Donald Constable and Si Woo Kim are one stroke above the magic number with one round to go ... Brett Bergeron withdrew during the fifth round with a back injury.