Freeman scored 18 points, and DaJuan Summers had 14 in No. 21 Georgetown's 75-48 victory over Maryland on Sunday in the Old Spice Classic.
"Everyone on our team is friends with the guys on their team, and so that comfort level raises the stakes," Georgetown coach John Thompson III said.
Georgetown held Maryland guard Greivis Vazquez, who entered averaging 20 points, to just two in what has become a rare meeting between the two schools.
"It was an emotional game for us," Sapp said. "Like Coach said, those are our friends on the other side. We just wanted to go out there and get the win. We didn't look at them as friends. Once we got on the floor it was just, you're our enemy right now."
Greg Monroe added 12 points to help Georgetown (4-1) rebound from a 90-78 loss to No. 12 Tennessee on Friday.
"I think our team improved this week," Thompson said. "I think we learned a few lessons from that Tennessee game."
Eric Hayes and Adrian Bowie had 11 points each for Maryland. The Terrapins (4-2) beat No. 5 Michigan State on Thursday and lost to ninth-ranked Gonzaga on Friday.
"I'm disappointed with the way we played tonight," Maryland coach Gary Williams said. "We did get a win over a Top-5 team. Gonzaga, we played OK. Tonight we didn't play."
Sapp had all of his 10 points as Georgetown took a 38-20 halftime lead. The Hoyas, who led by 21 points during the first half, made 10 of their first 14 shots.
"I'll take the responsibility. We weren't ready to play," Williams said. "You have to get your team ready to play. We walked out on the court tonight, I thought we were slow. We weren't aggressive. When you play a good team, you pay the price."
Georgetown continued to control play in the second half, going up 61-33 with 13 minutes left on Monroe's basket. The freshman center has scored in double digits in five consecutive games.
Consecutive baskets by Freeman and Chris Wright extended Georgetown's advantage to 73-38 with 7Â½ minutes remaining.
Maryland shot 31.6 percent (18-of-57) and made 9 of 12 free throws. Georgetown shot 53.1 percent (26-of-49 and was 16-of-22 from the line.
It was just the third game between the two DC-area teams since 1980, and 63rd overall. The last meeting came in the 2001 NCAA tournament when Maryland beat Georgetown 76-66.