This may seem like a low total, but it's not given who these teams are and where this game is being played. 
Texas Tech has a top defensive coach in Chris Beard. The Red Raiders rank in the top 15 in defensive efficiency, giving up more than 75 points only once in eight games. They also haven't met an opponent nearly the defensive caliber of Louisville. 
The Cardinals rank 15th in the nation in fewest points allowed at 57.6 and in the top-five in defensive efficiency giving up 0.853 points per possession. Louisville has held its last two opponents - Michigan and Pittsburgh - to an average of 44.5 points a game. Only once have the Cardinals permitted more than 62 points during their last eight games. 
Making things worse for Texas Tech is its leading scorer, freshman guard Jahmi'us Ramsey is questionable with a hamstring injury. He's missed the last three games - all Texas Tech losses. The Red Red Raiders have averaged 62.6 points in regulation during those three defeats. 
This game is at neutral site Madison Square Garden as part of the Jimmy V Classic tournament in New York. The Garden is known for being favorable to Unders because of the tough shooting backdrop, especially so for teams not use to playing there.