Updated

Palm Beach Gardens, FL (SportsNetwork.com) - Brad Fritsch fired a 6-under 66 in Sunday's fourth round and he extended his advantage to six shots at the Web.com Tour Qualifying Tournament.

Fritsch finished 72 holes at 20-under-par 266, which is six shots better than second-round leader Rick Cochran. Fritsch played his fourth round on the Champion Course Sunday.

"My caddie and I set a goal and we're already there so we have to readjust the goal because I know there are a bunch of good players behind me," said Fritsch. "I'm going to keep my head down and keep going."

Play rotates over the par-71 Champion Course and the par-72 Fazio Course at PGA National for the six-round tournament.

Cochran carded a 2-under 69 and he is alone in second place at 14-under 272. Ted Purdy also shot a 69 and he holds sole possession of third place at 13- under 273.

Hunter Hamrick (68) and Andrew Landry (69) are both tied for fourth at 12- under 274, while Michael Hebert (66), Greg Eason (67) and Matt Fast (72) are tied for sixth at minus-11.

Fritsch started his day off strong before cooling off in the middle of his round. The Canadian drained three birdies on his first four holes on one, two and four before closing out his front nine with five straight pars from five.

Fritsch traded a birdie on the 10th with a bogey on the 11th, which was his only blemish on the day. Fritsch made his fifth gain on No. 13, moving him to minus-4. Following a trio of pars from 14, Fritsch finished with back-to-back birdies on 17 and 18 to push his advantage to six heading into Monday's fifth round.

Cochran, also playing on the Champion Course, played the front nine at even par with a birdie on five and a bogey on seven. Cochran made two birdies on 12 and 15 on the back nine to go along with seven pars to finish off his 2-under 69.

Purdy, playing on the Champion Course, made one birdie on the front nine on No. 2 and made the turn at minus-1. Another gain on 12 was canceled out by a bogey on 14, but Purdy finished strong with a birdie at the last to complete his 69.

NOTES: Fritsch's best finish on tour last year was at the Rex Hospital Open, where he tied for fourth. He has never won on tour ... Fritsch had four top-10 finishes on the Web.com Tour last season ... The Champion Course has hosted the PGA Tour's Honda Classic since 2007.