Groningen claimed their first-ever piece of silverware by defeating PEC Zwolle 2-0 in the KNVB Cup final on Sunday.
Erwin van de Looi's men had the better of the first half but did not make the breakthrough until just after the hour mark when Albert Rusnak fired home after good work from substitute Jarchinio Antonia.
The two combined again 10 minutes later when Antonia created space for himself on the right before teeing Rusnak up for a simple finish.
In truth, Zwolle, the reigning champions, never looked like recovering from one-goal down, let alone two, and Groningen held on quite comfortably to collect the first trophy in their 44-year history.
Rusnak could not quite believe his luck, with the 20-year-old Slovak only having joined Groningen from Manchester City earlier this season.
"This feels fantastic," the attacker told FOX Sports. "This is my first year in the Netherlands, so to experience this already is unbelievable.
"For me, this was the most important match in my career. We really won as a team today. How you do it does not matter - it's all about winning."
Groningen's KNVB Cup victory means that they will compete in next season's Europa League, their second consecutive season in the European tournament following their Eredivisie play-off qualification last year.