It is the 29-year-old's second win on the European Tour.
Two wins in three starts 🏆@JohnCatlin59 wins the #DDFIrishOpen. pic.twitter.com/xTCMfRgZBB
Advertisement— DP World Tour (@DPWorldTour) September 27, 2020
Catlin finished at 10-under par, ahead of yesterday's leader Aaron Rai.
Rai needed a birdie on the final hole to force a playoff, but could not make it stick, finishing 2 shots adrift on eight-under.
There were no Irish front-runners in this year's tournament, with Northern Ireland's Jonathan Caldwell the best of the bunch finishing just outside the Top 50.
