"Coach told us in the locker room, 'Let's go out and win this tournament,'" Vasquez said. "That fired us up."
Maryland is one of two teams in the field that didn't receive a vote in this week's AP poll. Four squads are ranked, topped by the Spartans.
On the court, however, the Terrapins took charge.
After falling behind by three early in the second half, Maryland (4-0) countered with a 23-5 run to grab the lead for good. The Terrapins shut down Michigan State star Raymar Morgan and shot 9-of-19 on 3-pointers to 2-of-9 for the Spartans (2-1), who were led by Travis Walton's 16 points.
Maryland built an 18-point lead with 5 minutes left, then never let Michigan State get closer than 15.
"That's as good as any team I've coached has played with a lead," Williams said. "We didn't take bad shots, didn't lose focus."
Next up for the Terrapins on Friday is another test against a Top Ten team. Maryland will play No. 9 Gonzaga, which beat Oklahoma State 83-71.
Williams said he often plays bad cop in practice, trying to get his team to unite against one foe
- him.
But on Thursday, the target instead was a Michigan State team that went 12-for-27 from the free throw line. Morgan took only three shots in 14 minutes because of foul trouble and scored four points. He had been averaging 21.5 per game.
"The worst thing that could have happened, happened," Michigan State coach Tom Izzo said. "Ray never really got into the game. We just couldn't have that with all our other issues."
Izzo was particularly flummoxed by the poor foul shooting.
"I don't think I've seen anything like that before in my career," Izzo said.
MSU was missing top rebounder Goran Suton because of an injury and got limited minutes from Delvon Roe, who is coming off two knee operations.
"We're in a dilemma now with Suton out," Izzo said. "We can't leave Delvon in too long. It's really been a mess with that thing, to be honest."
The depth issues forced Izzo to play up to four freshmen at a time.
"We're not a top five, top 10 team with all that in there," he said.
The game figured to match Michigan State's accurate 3-point shooting against Maryland's strong perimeter defense. The Spartans came in shooting 43.8 percent from behind the arc, while Terps opponents were making only 19.6.