The Harvard offense also performed well on Saturday, shooting 46 pecent from the field.
"We made some free throws and some plays," Sullivan said. "We were able to get the ball inside."
The victory was especially sweet given Friday night's narrow loss to Yale.
In both games, Harvard jumped out to first-half leads. But on Saturday, the Crimson was able to hold on for the victory.
"We knew that both games were going to be tough and close," Gilmore said. "There is so little difference between a win and a loss in this league--we played just as hard [in both games]."
"It kind of got a monkey off our back," Rankin said.
Harvard faces another test this upcoming weekend when the team travels to Cornell on Friday and then to Columbia on Saturday.
"We have a tough weekend coming up," Snowden said. "Columbia is playing good basketball. It's a weekend we'd really like to sweep."
HARVARD, 66-61 at Briggs Cage (Saturday) Brown 25 36 -- 61 Harvard 30 36 -- 66
Brown: Koplik 3-3 0-1 6; Stewart 2-2 0-0 4; Rowley 0-0 0-0 0; White 1-2 3-3 5; Lloyd 3-14 4-4 11; Cole 4-13 2-3 10; Blackison 2-9 4-5 8; Joseph 4-7 2-3 10; Silas 0-0 3-4 3; Bradley 2-2 0-0 4; Newborn 0-3 0-0 0; Thanos 0-1 0-0 0. totals 21-56 18-23 61.
Harvard: Campbell 3-7 3-4 10; Leake 2-6 3-4 7; Gilmoe 1-6 6-6 8; Morris 0-0 0-0 0; Mann 1-3 0-0 2; Scott Snowden 7-10 3-6 17; White 3-6 0-0 6; Fricka 1-1 0-0 2; Rankin 5-10 1-3 12. Totals: 24-52 16-25 66.