The Tigers (10-7) were held to a season low in scoring as the Mustang defense conceded just 8-of-49 field goal attempts on the night.
"Newell-Fonda made us play fast and got us out of our rhythm and were very physical," said Spencer head coach Don Martindale said. "When you shoot that type of percentage against a team like that, you're not going to have a very good chance. We just missed a ton of shots."
Renee Maneman led the Mustangs with 14 points, nine rebounds, four assists and three steals.
For the season, Maneman is averaging an even 15 points, 5.5 assists and 4.5 rebounds. She knocked down 6-of-12 attempts on the night and is shooting and at 50% on the season as well.
The Mustangs knocked down 21-of-46 as a team, and overcame a rough night behind the arc, where they made just 1-of-12. They'll also look to shore up their free-throw shooting after a 10-for-22 outing.
Andrea Christensen notched 11 points and four rebounds, Brianna Wells had seven points and five rebounds, Taiyler Schrank and Taylor Lago scored six apiece, and Claudia Larsen notched five.
Newell-Fonda led 15-8 after one, 28-17 at half and 39-20 after three.
"This was a very physical battle," said Newell-Fonda head coach Dick Jungers. "Both teams played great defense. We were able to dictate the tempo at times and that gave us a big opportunity to make more scoring opportunities. Our girls did a great job of rebounding the basketball. We were able to get to the free throw line a lot, but did not capitalize on those opportunities. I was very pleased with our girls effort and energy. We are moving the ball well on offense and our defense flat out played tremendously. Spencer is a very good well-coached team.
The win makes five straight for the Newell-Fonda girls, with their only loss coming at the hands of Class 3A's third-ranked Estherville-Lincoln Central
The Mustangs (16-1) are at home tonight against South Central Calhoun. They have two games next week at Hinton and at home against Alta-Aurelia, before closing the regular season on February 5th against Sioux Central.