Elorriaga hit three 3-pointers over the first six-plus minutes of the second half as Boise State used a 19-4 surge to open a 59-44 lead.
The Broncos still led by 14 with 9 1/2 minutes to play before the Golden Grizzlies rolled off nine consecutive points to pull within 69-64 on a 3-pointer by Mondy with 7:51 remaining.
But Marks drove for two baskets as Boise State answered with six consecutive points to push the lead back to 11.
There's nothing to suggest the Jayhawks won't end up atop the Big 12 for a 13th season in a row. But what about a return to the Final Four?
Colorado State graduate transfer John Gillon has chosen Syracuse, giving the Orange a potential starter at point guard entering the 2016-17 season.
DeSean Murray, who averaged 20.2 points as a sophomore at Presbyterian, will transfer to Auburn to play for coach Bruce Pearl.