Breunig, who also had nine rebounds, had 18 points in the second half when the Grizzlies (3-3) shot 63 percent (20 for 32) and outscored the Dons (4-4) 54-26.
Fabijan Krslovic and Breunig had two baskets each when Montana had a 10-0 run early in the second half for a 40-27 lead. The Grizzlies added a 16-0 run, with Wright scoring six and Breunig five, that made it 66-38 with 6:36 to play.
Devin Watson had 15 points and Tim Derksen 14 for San Francisco, which lost for the first time in 10 meetings with the Grizzlies. The Dons shot 31 percent, making 7 of 28 3-pointers, and had 17 turnovers.
Montana finished at 54 percent. Krslovic had 11 rebounds and Wright seven assists.