Phil Forte scored 14 points and Nick Banyard scored 10 for Lewisville Marcus (38-1), which lost in the semifinals last season.
Johnathan Jordan scored 18 points for Hightower (29-8), which shot just 33 percent, including 0-13 on 3-pointers in scoring its second-fewest points on the season.
Lewisville Marcus shot 51 percent and outrebounded Hightower 29-20 and had 16 assists to just one for Hightower.
Both teams got off to a slow start and Lewisville Marcus led 19-15 at halftime. The Marauders slowly stretched their lead in the second half and led by as much as 16 in the fourth quarter.