More than half of Fremd's points came from behind the 3-point line on Saturday.
And more than half of the 10 3-pointers came from members of the same family.
Senior sisters Midori and Hayley Williams each fired home three 3-pointers while classmate Grace Tworek tossed in four from long range as the Vikings handed Glenbrook South its first loss.
Fremd's 59-44 triumph in its own Chicagoland Invitational Showcase improved the Vikings record to 6-2 while the Titans stand at 7-1.
"When they make 10 3-pointers, you are not going to beat them," said Glenbrook South coach Steve Weissenstein. "They were clicking on all cylinders. They're a very good team."
Tworek led the Vikes with 18 points followed by Midori Williams (12 points), Hayley Williams (11), senior Missy Adrian (8) and freshman Emily Klaczek (6).
"Glenbrook South is definitely a good team," said the Harvard-bound Tworek. "We tried to work harder on our offense in the second half and everyone contributed to that.
"This was statement game for us. They are a ranked team so we needed to come together as a team and achieve our goal."
The most field goals in the game went to Denver-bound Carie Weinman, who tossed home 11, including a pair of 3-pointers en route to a game-high 26 points.
The 5-foot-9 senior guard is averaging 25 points a game, and Saturday was only the second time she played into the fourth quarter of a game.
"You can see, she's a phenomenal player," said Weissenstein, a Hall of Fame coach who played basketball at Prospect High School. "And she scored 26 against a great defensive team like Fremd. She really battled for those points, too."
Fremd coach Dave Yates was in full agreement.
"She is an amazing player," he said. "I thought we made her work hard for her shots, and she still hit them. That's just a testament to how good she is."
Weinman's drive and basket got South to within 15-12 at the start of the second quarter and the Titans stayed close when sophomore Libbie Vanderveen connected from 3-point range to get to within 18-15.
The Vikes were able to pull away to a 31-21 halftime lead thanks to 7 points from Tworek in the final 1:12 of the second quarter.
She hit 2 free throws, then scored on a fastbreak layup and hit a 3-pointer in the final seconds for the 10-point cushion.
Yates liked that his team never let the Titans closer than 9 points in the second half.
"It was nice to see a lot of good pressure shots," Yates said. "We challenged our team to step up against a ranked team and I was pleased with what I saw.
"They (Glenbrook South) would kind of do something to get a little closer but we'd get a big shot to keep them out of harm's way."
Weissenstein says the Titans need other girls to step up.
"We had some open looks but we've got to finish the plays," he said. "Some of that is the fact that Grace Tworek (6-foot-2 guard-forward who had 10 rebounds) is in the middle but we told them that she can't go after everything because she has to stay in the game and can't get in foul trouble."