Marco Dawson shot a 4-under 68 on Sunday on PGA West's TPC Stadium Course to take a three-stroke lead into the final round of the PGA Tour Qualifying Tournament.
The 48-year-old Dawson had a 17-under 343 total. He made three PGA Tour starts this year and also played in 21 Nationwide Tour events.
The top 25 in the six-round event will earn PGA Tour cards.
Nationwide Tour player Stephen Gangluff was second after a 67 on the Stadium course.
Harris English, a Nationwide Tour winner this year while still at college, was 13 under along with Brendon Todd. English shot a 70, and Todd had a 68. They played the Stadium course.
Dawson began the six-round event with a 73 but his form ever since has been excellent, with rounds of 68, 67, 67 and Sunday's 68 taking him to the 17-under-par aggregate of 343.
And for the first time this week, Will Claxton didn’t end the day with at least a share of the lead. The former Auburn University player stumbled to his worst round of the week, a 76, to slide into a share of fifth place, along with former Ryder Cup player Vaughn Taylor, Brian Harman and Jarrod Lyle.
Several former major champions are competing but all could miss out.
The 2002 PGA Championship winner Rich Beem stands tied for 122nd and out of contention after a 74, while David Duval, the former British Open champion and world No. 1, finally made a positive move after treading water through his opening round rounds. Duval had a fifth round of 68 to nudge him up to a tie of 63rd, but he will almost certainly have to shoot in the mid-60s Monday to stand any chance.
Shaun Micheel, the 2003 PGA Champion, languishes in 111th following a 76.
The best-placed of the major winners is former two-time U.S. Open winner Lee Janzen who had a 71 for a second day in a row to stand tied for 42nd.
Jeff Maggert, who played on three Ryder Cup teams in the 1990s, has every chance of earning a card after a 66 saw him shoot up the leaderboard from 41st to a tie for 13th.
England's Greg Owen improved his prospects too, with a 70 allowing him to reach a tie for 34th.