The host Wildcats knocked down 10 3-pointers throughout the game to stay within striking distance but the Buccaneers dug deep when it mattered most to come away with another gritty win.
"Anytime you can win on the road against a quality team, it feels good," said Grand Haven head coach Greg Immink. "We knew they were going to shoot a lot of threes and give them credit for knocking down some tough shots early on in the game.
"I thought we did a much better job of contesting those shots in the second half. Our post players did a nice job of protecting the hoop whenever they attempted to drive inside, and that made them one-dimensional. At the point, they really had to force the issue with those 3-point attempts, and we were able to keep them off the glass for the most part."
Casey Constant and Bryce Taylor each scored 14 points to lead the Bucs (5-2), while Mason Mahacek and Trevor Holleman each scored six points off the bench.
"Offensively, we are still working on it," said Immink. "The ball got a little sticky at times. I would have liked to see a little better ball movement and better shot selection at times.
"Mason and Trevor are energy guys for us, and they got some expanded minutes tonight because they played so well. Trevor rebounded well and got some nice put-backs on the offensive glass and Mason did a nice job on defense, especially against their perimeter shooters, and he drove the lane on offense well, too.
"We needed both of them tonight, and they gave us a nice boost."
Grand Haven jumped out to an 8-0 lead in the first quarter, but Jenison would end the quarter on a 10-2 run to tie the game at 10-10 after one.
The Buccaneers opened the second quarter on a 10-0 run, but the Wildcats answered once again, as Nate Deymen knocked down back-to-back 3-pointers to cut into the Grand Haven lead. The Buccaneers would hang on for a 26-20 lead at halftime, despite not making a single 3-pointer compared to five for Jenison.
The third quarter would see Grand Haven pull ahead for another double-digit lead, as Constant knocked down a deep 3-point attempt and Mahacek ripped away a steal and converted on the other end for a layup.
The Wildcats wouldn't go away, however, as they knocked down three more 3-pointers in the quarter to cut the lead to 40-38 heading into the fourth quarter.
In the final stanza, Jenison's Grant Fleser knocked down a 3-pointer from the corner to give the Wildcats their first lead of the game at 41-40 with six minutes left in the game.
In what proved to be the defining moment of the game, the Buccaneers called a timeout on the ensuing possession. Out of the break, coach Immink drew up a play that got Taylor an open look from deep. The veteran guard knocked home the attempt to give Grand Haven a 43-41 lead that they would hold for the rest of the game.
After a few empty possessions by both squads, Owen Ross would rumble down the lane for an and-1 opportunity to extend the Bucs' lead to 46-42 with 3:42 left to play.
Grand Haven would ice the game away from the free-throw line the rest of the way, as the Bucs would leave Jenison with a well-earned 57-50 non-conference win.
Grand Haven (5-2) will travel to three-time defending O-K Red Conference champion West Ottawa (3-4, 0-1 O-K Red) for the Bucs' first league game of the season.