Australians Aaron Baddeley and Matt Jones have failed to snatch the final spot in the field for the Masters after Canadian Corey Conners won the Texas Open to book his place at Augusta.
Conners claimed his first PGA Tour victory to become the first golfer in nine years to win on the lucrative circuit after qualifying on a Monday.
He made three birdies in his final five holes on Sunday to card a six-under 66 and finish at 20-under 268.
It was a wild closing round for 27-year-old Conners who followed four early birdies with four consecutive bogeys on the front nine before he stormed home with six birdies and three pars on the back nine.
"Definitely a dream come true. It was an amazing day," Conners told PGA Tour Radio.
American Charley Hoffman (67), the champion in Texas three years ago, was second at 18 under while Ryan Moore carded a sizzling eight-under 64 to finish third.
Baddeley (71) and Matt Jones (70) finished in a tie for 30th at seven under.
Next stop for Conners is a return to Augusta, Georgia, for the first major of the year starting on Thursday. He played the Masters as an amateur in 2015 and missed the cut.
Si Woo Kim, The Players Championship winner in 2017, led the opening three rounds but dropped to a tie for fourth with Brian Stuard (15 under) after an even-par 72 on Sunday.
Two of the top three finishers last year at Augusta missed the top 10 in Texas.
Rickie Fowler was tied for 17th at 10 under with a final-round 69, and Jordan Spieth (72) was seven under.
The last player to qualify on Monday and win a PGA Tour event was Arjun Atwal in 2010 at the Wyndham Championship.
That was the first time it had been done in 24 years.