Oakland trailed early but surged ahead on a 17-7 run capped by a Hayes 3-pointer to lead 32-25 with 5:52 left before the break. The Golden Grizzlies led 36-33 at halftime.
A Petros jumper early in the second half stretched the Golden Grizzlies' lead to 44-35 before Youngstown State battled back to tie it, 59-59, with the help of a Cameron Morse 3 with 7:48 to play. But Oakland pulled ahead again for good and finished on a 12-7 run in the final minutes to seal the win.
Sidney Umude scored 16 points for the Penguins (11-19, 2-13).