Adrian Meronk described it as a "relief" to finally win his first DP Tour event, after his late scoring surge helped him to the top of the leaderboard in the Irish Open.
The 29-year-old carded two birdies and an eagle in the final four holes of Sunday's play to close the round on 66 and finish 20-under par.
New Zealand's Ryan Fox finished as runner-up on 17-under, while South Africa's Thriston Lawrence finished third on 16-under.
Scotland's David Law, American John Catlin and Paraguay's Fabrizio Zanotti shared fourth on 15 under to claim the three places on offer in the 150th Open Championship at St Andrews.
After recording three top-three finishes in his last six starts, there was only one emotion on Meronk's mind after sealing the win.
"It's such a relief, to be honest," said the Pole.
"I've been coming quite close a couple of times this year and to finally open the door is just a dream come true. That's why we practice every day and I'm super happy."
Meronk's win makes him the first Polish DP Tour winner in history, and when asked how it feels to be a role model for his nation, he replied: "I love it, I love it.
"I'm not stopping, I'm gonna keep going forward and it's just another step for me. I'm super excited (to win) here in Ireland, such a great history. I can't describe it.
"I was imagining this picture yesterday, what it might look like and it looked exactly how I imagined it and it was an unbelievable feeling. To hit such a good shot on the last hole, I'm super proud of myself and my caddie."