Brewster finished with a score of 334.30, making her the girls' Northeast Tennessee regional diving champion. She bested Science Hill's Olivia Howard by nearly 20 points.
Howard defeated Brewster last week at the Big 6's meet, and Brewster said that was on her mind as she took to the diving board this time around.
"I came in thinking I had to do my best if I wanted to beat Olivia," she said. "I knew I needed to nail every dive."
Brewster's first dive of the night was her best, but she was consistently good for the next 10 and that was enough to fend off Howard.
Over the course of an 11-dive event, Brewster said, staying in the moment was the key.
"You can't worry about the last dive, and you can't worry about the dive to come," she said. "You have to take it one dive at a time."
Despite Brewster's brilliance, Howard and teammate Kaitlin Bevins finished second and third, respectfully, to give the Hilltoppers a boost heading into today's swimming events.
Emily Morin finished fourth and Taylor Miller fifth for Tennessee High. Sullivan South's Sierra Allen and Erin Hawbaker were sixth and seventh, respectively.
Science Hill's dominance was even more evident on the boys' side.
Dan Margotta won the diving championship while Jake Lyon claimed third and Travis Ramsey grabbed fourth for the Hilltoppers.
Margotta, a senior in his first year of competitive diving, piled up 239.80 points, giving him a two-point victory over Dobyns-Bennett's Casey Crawford.
Even though he did enough to earn the paper-thin win, Margotta said it was not his best performance.
"It was a real rough night," he said. "I was too tense in the beginning, but my brother sat me down and told me to just have fun with it."
Margotta and his teammates were excited about tacking some points on the board, giving the Hilltopper swimmers a jump on the competition today.
"Even though we're a separate part, we're still a part of the team," Margotta said. "It's nice to help out."