Muhammad Farrukh took 5 for 14 as Balbriggan put a serious dent in Cork's title charge with an 89 run (D/L) win.
The Pakistan professional, better known for his remarkable batting prowess, ripped through the Munster men's middle and late order as they slumped from 50 for 2 to 103 all out.
Duane Harper (3-23) and Sarfraz Anwar had removed the top three of Ross Durity (20), Stephan Grobler (13) and Morne Bauer 12) to open the door for Farrukh's fireworks.
Earlier, the Balbriggan total of 206 for 8 had been set up by a solid opening partnership of 65 between Ehtesham Ahmed (42) and Duane Harper (23).
Steady contributions from Malcolm Byrne (29), Asif Iqbal (27) and Muhammad Farruk (26) meant Balbriggan passed the 200 mark to set up the ultimately comfortable win.
Despite the defeat Cork's spirits were lifted by the news that promotion rivals Leinster had come up a cropper at home to Rush.