The freshman guard scored 17 points, hitting all six of his field goals including 5-for-5 on 3-pointers, as the Tigers defeated SMU 88-52 on Saturday.
"It felt good, but you probably won't see that again," Mack said of the shooting performance. "It was a real confidence builder. I know I can go out there and hit the 3."
Mack's shooting helped Memphis (19-3, 9-0) finish 15-for-25 on 3-pointers, and the Tigers shot 61 percent overall.
"If we're making 3s the way we did today, we can beat you by a bunch," Memphis coach John Calipari said.
Memphis won its 26th consecutive home game, and 11th straight overall. It was the most points allowed by the Mustangs (13-9, 2-6), who entered the game with the conference's best defense against 3-pointers, holding opponents to 31 percent on the season.
"Our game plan was to attack with the zone and not let them have dribble penetration," SMU coach Matt Doherty said. "Memphis is not considered a great 3-point shooting team, but they shot 60 percent for the game at the 3-point line. Once they started shooting that well from the 3-point line, our game plan fell apart."