Three goals in the opening period Saturday were just enough for the Gophers.
Minnesota State Mankato rallied for one goal in the second period and one in the third but still lost 3-2 at Mariucci Arena before an announced crowd of 9,710.
Freshman Kyle Rau's 11th goal of the season, late in the first period, turned out be his fifth game-winner.
By sweeping the Mavericks -- Friday's score was 4-2 -- the Gophers (13-4-1, 10-2-0 WCHA) remained in first place in the WCHA race with 20 points, one ahead of surging Minnesota Duluth.
Minnesota State (3-12-1, 2-9-1) had a dangerous-looking three-on-one rush with 40 seconds left in the game, but defenseman Justin Holl broke it up.
"One of their players tried to saucer a pass, and [the puck] hit the shaft of my stick," Holl said, "and I knocked it away."
Whew.
Goalie Kent Patterson stopped 26 shots for the Gophers, Austin Lee 37 for the Mavericks.