Karr (Providence Catholic H.S./Tinley Park, IL) delivered her third straight double-double and ninth of the season totaling 26 points and 14 rebounds. Andes (Hall H.S./Princeton, IL), meanwhile, tied a career-high with her 13 rebounds to go along with 12 points for her second double-double in as many games.
Freshman forward Katie Gonnering (Freedom H.S./Seymour, WI) was just as key an element to the Saints rallying from a 12-point first half deficit to gain the Chicagoland Collegiate Athletic Conference victory with her 20 points and 11 caroms. It was her team-leading 11th double-double of the season.
Freshman guard Cydney Weisflog (Oak Creek H.S./Oak Creek, WI) chipped in with another 13 points.
For the Saints, it was their third upset of a ranked team this season and snapped a season-high five-game losing skid.
Crucial to the victory, which guaranteed the Saints a winning campaign, were USF's sizeable advantages in the rebounding department and at free throw line. Head coach Brian Michalak's club nearly had as many offensive rebounds (25) as Saint Xavier had total rebounds (26) in the Saints' dominating 56-26 difference on the boards. At the foul line, USF outscored Saint Xavier, 33-11. Nine of the free throws came in 10 attempts in overtime, where the Saints outscored SXU, 16-7.
Saint Xavier (20-8, 6-3) built the biggest lead of the game, 34-22, before the Saints closed the gap to one, 38-37, in the remaining 3:25 before halftime.
Neither team could break away from the other in the second half with USF's 48-43 lead at the 10:48 mark being the largest separation in the second 20-minute period. Three ties resulted in the closing 2:56 with neither team scoring in the final 1:20 after Gonnering forced the 10th and final tie of the game at 64-all. Both teams had a pair of opportunities after that only to come up empty each time.
In the overtime, Karr's layup to start the extra session gave the Saints the lead for good with Weisflog nailing a clutch three-pointer after 2:21 of scoreless action to make it a 69-64 game. USF's only basket the rest of the way was a layup by Gonnering with the other nine points coming at the foul line. Four of those were by Karr, who was a perfect 8-for-8 at the charity stripe on the night.
USF, which suited up only seven players, had its starters play all but 14 of the 225 total minutes.
Saint Xavier, which was held scoreless for nearly three minutes to start the overtime, was led in scoring by Marissa Young with 15 points.
The Saints wrap up the regular season on Saturday at Indiana University South Bend, where they will be seeking revenge for an earlier 77-58 loss on Feb. 4. Game time is 11 a.m. CST.