The Terps held a sizable lead for the vast majority of the game.
Reese finished with a career-high 19 points and 12 rebounds.
The victory marked the Terps' 46th consecutive home-opener win in coach Kevin Willard's first game.
With strong recruits poised to join the squad in 2021 and 2022, the Terps are hopeful their growing pains will be short-lived.
The Arlington product is the No. 19 ranked point guard in his class.
Cornish is a four-star guard from Maryland, attending high school in South Carolina.
Cornish is the No. 77 prospect in the nation per 247Sports.