In winning, the Hawks improved to 7-3 and are 4-0 at Hagan Arena, with Villanova visiting on Saturday. Creighton (7-1) is ranked No. 17 in the USA Today/ESPN Coaches Poll and No. 19 by the Associated Press.
The Hawks also received a huge effort from 6-foot-8 sophomore Ronald Roberts, a sixth man who offers starter's minutes and production.
Roberts had 12 points, six rebounds, three blocked shots, and one of the most spectacular dunks, a tomahawk jam on a feed from Jones.
"What was he, 11 feet in the air when he threw it down?" asked amazed St. Joseph's coach Phil Martelli.
The Hawks trailed by as many as eight points in the first half but led, 35-30, by intermission. Roberts had seven points and six rebounds in the first half and held the fort when center C.J. Aiken and forward Halil Kanacevic both sat for extended minutes after each drew two first-half fouls.
"We had guys in foul trouble and I had to step up, play hard, and play smart," Roberts said.
Creighton was led by 6-7 sophomore all-American candidate Doug McDermott, who had 26 points and was the main reason so many NBA scouts were in attendance. He hit 5 of 7 shots from beyond the arc but was limited to just 16 field goal attempts.
The key was that St. Joseph's beat Creighton at its own game. The Bluejays entered the contest averaging 87 points per game. St. Joseph's continually switched defenses, alternating between man-to-man and zone coverage, and Creighton wasn't able to run-and-gun so much.
"They often showed zone, but they were really playing man-to-man and we got a little rattled," said McDermott, the son of coach Greg McDermott.
When C.J. Aiken scored an alley-oop dunk to extend the Hawks' lead to 67-55 with 1 minute, 49 seconds left, it looked over, but Creighton cut it to 69-63 with 1:01 left.
Jones then made a driving layup and ensuing free throw, and the fans began making celebration plans.
Contact staff writer Marc Narducci at 856-779-3225, firstname.lastname@example.org, or @sjnard on Twitter.