Cauley closed with a bogey-free 7-under 65 at Sycamore Hills for a one-stroke victory over Colt Knost. The 24-year-old former Alabama player birdied five of the first six holes and added birdies on the par-5 12th and 15th. He finished at 20-under 268 for his first professional victory.
''I played really well all week,'' Cauley said. ''I got off to a really good start today.''
Cauley was 143rd in the PGA Tour's FedEx Cup standings, forcing him to play the Web.com Tour Finals for the second straight year. Nos. 126-200 in the FedEx Cup and Nos. 26-75 on the Web.com Tour's regular-season money list are playing for 25 PGA Tour cards based on earnings in the four-event series, with Cauley earning more than enough Sunday to secure a spot.
''After sitting around home for a while, it's nice to come out and play and play well and get my first win as a pro,'' Cauley said. ''Today was a lot of fun. I'm looking forward to playing next week.''
Knost, the third-round leader, shot 68, missing a 10-foot birdie try on the final hole. He earned $108,000 to wrap up a tour card after finishing 34th on the Web.com Tour money list.
The top 25 players on the Web.com money list earned PGA Tour cards last week. They are competing against each other for PGA Tour priority, with regular-season earnings counting in their totals and the final leader getting a spot in The Players Championship.
England's Greg Owen, 27th on the Web.com money list, finished third at 16 under after a 70. He earned $68,000, likely enough to get a card.
Lingmerth, 134th in the FedEx Cup, finished with a 64. Gillis, 54th on the Web.com money list, shot 66.
Carlos Ortiz, the Mexican player who topped the Web.com money list, missed the cut. He won the regular-season finale in Oregon for his third Web.com victory of the season, making him fully exempt on the PGA Tour. He has earned $515,403 - $175,365 more than second-place Andrew Putnam.
Putnam tied for 12th at 11 under after a 67.
The Chiquita Classic is next week in Davidson, North Carolina, followed by the Nationwide Children's Hospital Championship in Columbus, Ohio, and the Web.com Tour Championship in Ponte Vedra Beach, Florida.